Pyridazinones and methods of use thereof

ABSTRACT

Disclosed are compounds according to Formula (I), and related pharmaceutical compositions. Also disclosed are therapeutic methods, e.g., of treating kidney diseases, using the compounds of Formula (I).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority to U.S. ProvisionalPatent Application No. 62/732,728, filed Sep. 18, 2018; and U.S.Provisional Patent Application No. 62/780,553, filed Dec. 17, 2018.

BACKGROUND

Proteinuria is a condition in which an excessive amount of protein inthe blood leaks into the urine. Proteinuria can progress from a loss of30 mg of protein in the urine over a 24-hour period (calledmicroalbuminuria) to >300 mg/day (called macroalbuminuria), beforereaching levels of 3.5 grams of protein or more over a 24-hour period,or 25 times the normal amount. Proteinuria occurs when there is amalfunction in the kidney's glomeruli, causing fluid to accumulate inthe body (edema). Prolonged protein leakage has been shown to result inkidney failure. Nephrotic Syndrome (NS) disease accounts forapproximately 12% of prevalent end stage renal disease cases at anannual cost in the United States of more than $3 billion. Approximately5 out of every 100,000 children are diagnosed with NS every year and 15out of every 100,000 children are living with it today. For patients whorespond positively to treatment, the relapse frequency is extremelyhigh. Ninety % of children with Nephrotic Syndrome will respond totreatment, however, an estimated 75% will relapse. There is a need formore effective methods of treating, or reducing risk of developing,kidney disease, e.g., proteinuria.

Mammalian TRP channel proteins form six-transmembrane cation-permeablechannels that may be grouped into six subfamilies on the basis of aminoacid sequence homology (TRPC, TRPV, TRPM, TRPA, TRPP, and TRPML). Recentstudies of TRP channels indicate that they are involved in numerousfundamental cell functions and are considered to play an important rolein the pathophysiology of many diseases. Many TRPs are expressed inkidney along different parts of the nephron and growing evidence suggestthat these channels are involved in hereditary, as well as acquiredkidney disorders. TRPC6, TRPM6, and TRPP2 have been implicated inhereditary focal segmental glomerulosclerosis (FSGS), hypomagnesemiawith secondary hypocalcemia (HSH), and polycystic kidney disease (PKD),respectively.

TRPC5 has also been reported to contribute to the mechanisms underlyingregulation of innate fear responses. (J Neurosci. 2014 Mar. 5; 34(10):3653-3667).

Hence, there is a need for additional inhibitors of TRPC5 or TRPC4 orboth.

SUMMARY

This invention is based, at least in part, on the discovery thatTransient Receptor Potential Cation Channel, subfamily C, member 5(TRPC5), activity abolishes actin stress fibers and diminishes focaladhesion formation, rendering a motile, migratory podocyte phenotype.

One aspect of the invention is compounds that are antagonists of TRPC5or TRPC4 or both. In some embodiments, the compound of the invention isa compound of structural formula I:

or a pharmaceutically acceptable salt thereof;wherein:

“- - -” is a single bond or a double bond

X¹ is CH or N;

when “- - -” is a double bond, X² is CH or N;

when “- - -” is a single bond, X² is N(CH₃),

when X¹ is CH, X² is N or N(CH₃);

Y is —O—, —N(CH₃)—, —N(CH₂CH₂OH)—, cyclopropan-1,1-diyl, or —CH(CH₃)—;

Q is 2-trifluoromethyl-4-fluorophenyl, 2-difluoromethyl-4-fluorophenyl,2-trifluoromethylphenyl, 2-methyl-4-fluorophenyl,2-chloro-4-fluorophenyl, 2-chlorophenyl,1-(benzyl)-4-methylpiperidin-3-yl, 4-trifluoromethylpyridin-3-yl,2-trifluoromethyl-6-fluorophenyl, 2-trifluoromethyl-3-cyanophenyl,2-ethyl-3-fluorophenyl, 2-chloro-3-cyanophenyl,2-trifluoromethyl-5-fluorophenyl, or 2-difluoromethylphenyl;

R³ is hydrogen, —CH₂OH, —CH(OH)—CH₂OH, —NH₂, —CH(OH)CH₃, —OCH₃, or—NH—(CH₂)₂OH; and when “- - -” is a double bond, R⁴ is absent;

and when “- - -” is a single bond, R³ and R⁴ are taken together to form═O; and

each of R⁵ and R⁶ is independently hydrogen or —CH₃,

provided that if X¹ is N, X² is N, Y is —O— or —N(CH₃)—, and Q is2-trifluoromethylphenyl, then at least one of R³, R⁵, and R⁶ is nothydrogen.

In some embodiments, the compound of the invention is represented bystructural formula II:

or a pharmaceutically acceptable salt thereof; wherein:

R¹ is chloro, —CF₃, —CHF₂, or —CH₃;

R² is hydrogen or fluoro; and

R³ is hydrogen, —NH₂, —CH₂OH, or CH(OH)—CH₂OH.

In one aspect, the invention features a pharmaceutical compositioncomprising a compound of the invention and a pharmaceutically acceptablecarrier.

In one aspect, the invention relates to methods of treating, or reducingthe risk of developing, a disease or condition selected from kidneydisease, pulmonary arterial hypertension, anxiety, depression, cancer,diabetic retinopathy, or pain, comprising administering to a subject inneed thereof a therapeutically effective amount of the compound or thecomposition. In some embodiments, the disease is kidney disease,anxiety, depression, cancer, or diabetic retinopathy. In someembodiments, the disease or condition is kidney disease selected fromFocal Segmental Glomerulosclerosis (FSGS), Diabetic nephropathy, Alportsyndrome, hypertensive kidney disease, nephrotic syndrome,steroid-resistant nephrotic syndrome, minimal change disease, membranousnephropathy, idiopathic membranous nephropathy, membranoproliferativeglomerulonephritis (MPGN), immune complex-mediated MPGN,complement-mediated MPGN, Lupus nephritis, postinfectiousglomerulonephritis, thin basement membrane disease, mesangialproliferative glomerulonephritis, amyloidosis (primary), c1qnephropathy, rapidly progressive GN, anti-GBM disease, C3glomerulonephritis, hypertensive nephrosclerosis, or IgA nephropathy. Insome embodiments, the kidney disease is proteinuric kidney disease. Insome embodiments, the kidney disease is microalbuminuria ormacroalbuminuria kidney disease. In some embodiments, the disease orcondition to be treated is pulmonary arterial hypertension. In someembodiments, the disease or condition to be treated is pain selectedfrom neuropathic pain and visceral pain.

In some embodiments, the disease or condition is cancer selected fromchemoresistant breast carcinoma, adriamycin-resistant breast cancer,chemoresistant colorectal cancer, medulloblastoma, and tumorangiogenesis.

In some embodiments, the disease or condition to be treated istransplant-related FSGS, transplant-related nephrotic syndrome,transplant-related proteinuria, cholestatic liver disease, polycystickidney disease, autosomal dominant polycystic kidney disease (ADPKD),obesity, insulin resistance, Type II diabetes, prediabetes, metabolicsyndrome, non-alcoholic fatty liver disease (NAFLD), or non-alcoholicsteatohepatitis (NASH).

The methods are effective for a variety of subjects including mammals,e.g., humans and other animals, such as laboratory animals, e.g., mice,rats, rabbits, or monkeys, or domesticated and farm animals, e.g., cats,dogs, goats, sheep, pigs, cows, or horses.

The invention provides several advantages. The prophylactic andtherapeutic methods described herein are effective in treating kidneydisease, e.g., proteinuria, and have minimal, if any, side effects.Further, methods described herein are effective to identify compoundsthat treat or reduce risk of developing a kidney disease, anxiety,depression, or cancer.

Unless otherwise defined, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which this invention belongs. Although methods and materialssimilar or equivalent to those described herein can be used in thepractice or testing of the present invention, suitable methods andmaterials are described below. All publications, patent applications,patents, and other references mentioned herein are incorporated byreference in their entirety. In case of conflict, the presentspecification, including definitions, will control. In addition, thematerials, methods, and examples are illustrative only and not intendedto be limiting.

Other features, objects, and advantages of the invention will beapparent from the detailed description, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows albumin excretion in PAN-injured rats treated with compound100 or mizoribine.

FIG. 2 shows urine protein creatinine ratio data in AT1R transgenic ratstreated with compound 100 compared to vehicle, with AngII infusion.

FIG. 3 shows the urine protein creatinine ratio data presented in FIG. 2expressed as percent of baseline.

DETAILED DESCRIPTION Definitions

The term “acyl” is art-recognized and refers to a group represented bythe general formula hydrocarbylC(O)—, preferably alkylC(O)—.

The term “acylamino” is art-recognized and refers to an amino groupsubstituted with an acyl group and may be represented, for example, bythe formula hydrocarbylC(O)NH—.

The term “acyloxy” is art-recognized and refers to a group representedby the general formula hydrocarbylC(O)O—, preferably alkylC(O)O—.

The term “alkoxy” refers to an alkyl group, preferably a lower alkylgroup, having an oxygen attached thereto. Representative alkoxy groupsinclude methoxy, trifluoromethoxy, ethoxy, propoxy, tert-butoxy and thelike.

The term “alkoxyalkyl” refers to an alkyl group substituted with analkoxy group and may be represented by the general formulaalkyl-O-alkyl.

The term “alkenyl”, as used herein, refers to an aliphatic groupcontaining at least one double bond and is intended to include both“unsubstituted alkenyls” and “substituted alkenyls”, the latter of whichrefers to alkenyl moieties having substituents replacing a hydrogen onone or more carbons of the alkenyl group. Such substituents may occur onone or more carbons that are included or not included in one or moredouble bonds. Moreover, such substituents include all those contemplatedfor alkyl groups, as discussed below, except where stability isprohibitive. For example, substitution of alkenyl groups by one or morealkyl, carbocyclyl, aryl, heterocyclyl, or heteroaryl groups iscontemplated.

An “alkyl” group or “alkane” is a straight chained or branchednon-aromatic hydrocarbon which is completely saturated. Typically, astraight chained or branched alkyl group has from 1 to about 20 carbonatoms, preferably from 1 to about 10 unless otherwise defined. Examplesof straight chained and branched alkyl groups include methyl, ethyl,n-propyl, iso-propyl, n-butyl, sec-butyl, tert-butyl, pentyl, hexyl,pentyl and octyl. A C₁-C₆ straight chained or branched alkyl group isalso referred to as a “lower alkyl” group.

Moreover, the term “alkyl” (or “lower alkyl”) as used throughout thespecification, examples, and claims is intended to include both“unsubstituted alkyls” and “substituted alkyls”, the latter of whichrefers to alkyl moieties having substituents replacing a hydrogen on oneor more carbons of the hydrocarbon backbone. Such substituents, if nototherwise specified, can include, for example, a halogen (e.g., fluoro),a hydroxyl, a carbonyl (such as a carboxyl, an alkoxycarbonyl, a formyl,or an acyl), a thiocarbonyl (such as a thioester, a thioacetate, or athioformate), an alkoxy, a phosphoryl, a phosphate, a phosphonate, aphosphinate, an amino, an amido, an amidine, an imine, a cyano, a nitro,an azido, a sulfhydryl, an alkylthio, a sulfate, a sulfonate, asulfamoyl, a sulfonamido, a sulfonyl, a heterocyclyl, an aralkyl, or anaromatic or heteroaromatic moiety. In preferred embodiments, thesubstituents on substituted alkyls are selected from C₁₋₆ alkyl, C₃₋₆cycloalkyl, halogen, carbonyl, cyano, or hydroxyl. In more preferredembodiments, the substituents on substituted alkyls are selected fromfluoro, carbonyl, cyano, or hydroxyl. It will be understood by thoseskilled in the art that the moieties substituted on the hydrocarbonchain can themselves be substituted, if appropriate. For instance, thesubstituents of a substituted alkyl may include substituted andunsubstituted forms of amino, azido, imino, amido, phosphoryl (includingphosphonate and phosphinate), sulfonyl (including sulfate, sulfonamido,sulfamoyl and sulfonate), and silyl groups, as well as ethers,alkylthios, carbonyls (including ketones, aldehydes, carboxylates, andesters), —CF₃, —CN and the like. Exemplary substituted alkyls aredescribed below. Cycloalkyls can be further substituted with alkyls,alkenyls, alkoxys, alkylthios, aminoalkyls, carbonyl-substituted alkyls,—CF₃, —CN, and the like.

Unless otherwise specified, “alkylene” by itself or as part of anothersubstituent refers to a saturated straight-chain or branched divalentgroup having the stated number of carbon atoms and derived from theremoval of two hydrogen atoms from the corresponding alkane. Examples ofstraight chained and branched alkylene groups include —CH₂— (methylene),—CH₂—CH₂— (ethylene), —CH₂—CH₂—CH₂-(propylene), —C(CH₃)₂—,—CH₂—CH(CH₃)—, —CH₂—CH₂—CH₂—CH₂—, —CH₂—CH₂—CH₂—CH₂—CH₂— (pentylene),—CH₂—CH(CH₃)—CH₂—, and —CH₂—C(CH₃)₂—CH₂—.

The term “C_(x-y)” when used in conjunction with a chemical moiety, suchas, acyl, acyloxy, alkyl, alkenyl, alkynyl, or alkoxy is meant toinclude groups that contain from x to y carbons in the chain. Forexample, the term “C_(x-y) alkyl” refers to substituted or unsubstitutedsaturated hydrocarbon groups, including straight-chain alkyl andbranched-chain alkyl groups that contain from x to y carbons in thechain, including haloalkyl groups. Preferred haloalkyl groups includetrifluoromethyl, difluoromethyl, 2,2,2-trifluoroethyl, andpentafluoroethyl. C₀ alkyl indicates a hydrogen where the group is in aterminal position, a bond if internal. The terms “C_(2-y) alkenyl” and“C_(2-y) alkynyl” refer to substituted or unsubstituted unsaturatedaliphatic groups analogous in length and possible substitution to thealkyls described above, but that contain at least one double or triplebond respectively.

The term “alkylamino”, as used herein, refers to an amino groupsubstituted with at least one alkyl group.

The term “alkylthio”, as used herein, refers to a thiol groupsubstituted with an alkyl group and may be represented by the generalformula alkylS—.

The term “alkynyl”, as used herein, refers to an aliphatic groupcontaining at least one triple bond and is intended to include both“unsubstituted alkynyls” and “substituted alkynyls”, the latter of whichrefers to alkynyl moieties having substituents replacing a hydrogen onone or more carbons of the alkynyl group. Such substituents may occur onone or more carbons that are included or not included in one or moretriple bonds. Moreover, such substituents include all those contemplatedfor alkyl groups, as discussed above, except where stability isprohibitive. For example, substitution of alkynyl groups by one or morealkyl, carbocyclyl, aryl, heterocyclyl, or heteroaryl groups iscontemplated.

The term “amide”, as used herein, refers to a group

wherein each R^(A) independently represent a hydrogen or hydrocarbylgroup, or two R^(A) are taken together with the N atom to which they areattached complete a heterocycle having from 4 to 8 atoms in the ringstructure.

The terms “amine” and “amino” are art-recognized and refer to bothunsubstituted and substituted amines and salts thereof, e.g., a moietythat can be represented by

wherein each R^(A) independently represents a hydrogen or a hydrocarbylgroup, or two R^(A) are taken together with the N atom to which they areattached complete a heterocycle having from 4 to 8 atoms in the ringstructure.

The term “aminoalkyl”, as used herein, refers to an alkyl groupsubstituted with an amino group.

The term “aralkyl”, as used herein, refers to an alkyl group substitutedwith an aryl group.

The term “aryl” as used herein include substituted or unsubstitutedsingle-ring aromatic groups in which each atom of the ring is carbon.Preferably the ring is a 6- or 10-membered ring, more preferably a6-membered ring. The term “aryl” also includes polycyclic ring systemshaving two or more cyclic rings in which two or more carbons are commonto two adjoining rings wherein at least one of the rings is aromatic,e.g., the other cyclic rings can be cycloalkyls, cycloalkenyls, aryls,heteroaryls, and/or heterocyclyls. Aryl groups include benzene,naphthalene, phenanthrene, phenol, aniline, and the like.

The term “carbamate” is art-recognized and refers to a group.

wherein each R^(A) independently represent hydrogen or a hydrocarbylgroup, such as an alkyl group, or both R^(A) taken together with theintervening atom(s) complete a heterocycle having from 4 to 8 atoms inthe ring structure.

The terms “carbocycle”, and “carbocyclic”, as used herein, refers to asaturated or unsaturated ring in which each atom of the ring is carbon.The term carbocycle includes both aromatic carbocycles and non-aromaticcarbocycles. Non-aromatic carbocycles include both cycloalkane rings, inwhich all carbon atoms are saturated, and cycloalkene rings, whichcontain at least one double bond. “Carbocycle” includes 5-7 memberedmonocyclic and 8-12 membered bicyclic rings. Each ring of a bicycliccarbocycle may be selected from saturated, unsaturated and aromaticrings. Carbocycle includes bicyclic molecules in which one, two or threeor more atoms are shared between the two rings. The term “fusedcarbocycle” refers to a bicyclic carbocycle in which each of the ringsshares two adjacent atoms with the other ring. Each ring of a fusedcarbocycle may be selected from saturated, unsaturated and aromaticrings. In an exemplary embodiment, an aromatic ring, e.g., phenyl, maybe fused to a saturated or unsaturated ring, e.g., cyclohexane,cyclopentane, or cyclohexene. Any combination of saturated, unsaturatedand aromatic bicyclic rings, as valence permits, is included in thedefinition of carbocyclic. Exemplary “carbocycles” include cyclopentane,cyclohexane, bicyclo[2.2.1]heptane, 1,5-cyclooctadiene,1,2,3,4-tetrahydronaphthalene, bicyclo[4.2.0]oct-3-ene, naphthalene andadamantane. Exemplary fused carbocycles include decalin, naphthalene,1,2,3,4-tetrahydronaphthalene, bicyclo[4.2.0]octane,4,5,6,7-tetrahydro-1H-indene and bicyclo[4.1.0]hept-3-ene. “Carbocycles”may be substituted at any one or more positions capable of bearing ahydrogen atom.

A “cycloalkyl” group is a cyclic hydrocarbon which is completelysaturated. “Cycloalkyl” includes monocyclic and bicyclic rings.Typically, a monocyclic cycloalkyl group has from 3 to about 10 carbonatoms, more typically 3 to 8 carbon atoms unless otherwise defined. Thesecond ring of a bicyclic cycloalkyl may be selected from saturated,unsaturated and aromatic rings. Cycloalkyl includes bicyclic moleculesin which one, two or three or more atoms are shared between the tworings. The term “fused cycloalkyl” refers to a bicyclic cycloalkyl inwhich each of the rings shares two adjacent atoms with the other ring.The second ring of a fused bicyclic cycloalkyl may be selected fromsaturated, unsaturated and aromatic rings. A “cycloalkenyl” group is acyclic hydrocarbon containing one or more double bonds.

The term “carbocyclylalkyl”, as used herein, refers to an alkyl groupsubstituted with a carbocycle group.

The term “carbonate” is art-recognized and refers to a group—OCO₂—R^(A), wherein R^(A) represents a hydrocarbyl group.

The term “carboxy”, as used herein, refers to a group represented by theformula —CO₂H.

The term “ester”, as used herein, refers to a group —C(O)OR^(A) whereinR^(A) represents a hydrocarbyl group.

The term “ether”, as used herein, refers to a hydrocarbyl group linkedthrough an oxygen to another hydrocarbyl group. Accordingly, an ethersubstituent of a hydrocarbyl group may be hydrocarbyl-O—. Ethers may beeither symmetrical or unsymmetrical. Examples of ethers include, but arenot limited to, heterocycle-O-heterocycle and aryl-O-heterocycle. Ethersinclude “alkoxyalkyl” groups, which may be represented by the generalformula alkyl-O-alkyl.

The terms “halo” and “halogen” as used herein means halogen and includeschloro, fluoro, bromo, and iodo.

The terms “hetaralkyl” and “heteroaralkyl”, as used herein, refers to analkyl group substituted with a hetaryl group.

The term “heteroalkyl”, as used herein, refers to a saturated orunsaturated chain of carbon atoms and at least one heteroatom, whereinno two heteroatoms are adjacent.

The terms “heteroaryl” and “hetaryl” include substituted orunsubstituted aromatic single ring structures, preferably 5- to7-membered rings, more preferably 5- to 6-membered rings, whose ringstructures include at least one heteroatom, preferably one to fourheteroatoms, more preferably one or two heteroatoms. The terms“heteroaryl” and “hetaryl” also include polycyclic ring systems havingtwo or more cyclic rings in which two or more carbons are common to twoadjoining rings wherein at least one of the rings is heteroaromatic,e.g., the other cyclic rings can be cycloalkyls, cycloalkenyls, aryls,heteroaryls, and/or heterocyclyls. Heteroaryl groups include, forexample, pyrrole, furan, thiophene, imidazole, oxazole, thiazole,pyrazole, pyridine, pyrazine, pyridazine, and pyrimidine, and the like.

The term “heteroatom” as used herein means an atom of any element otherthan carbon or hydrogen. Preferred heteroatoms are nitrogen, oxygen, andsulfur.

The terms “heterocyclyl”, “heterocycle”, and “heterocyclic” refer tosubstituted or unsubstituted non-aromatic ring structures, preferably 3-to 10-membered rings, more preferably 3- to 7-membered rings, whose ringstructures include at least one heteroatom, preferably one to fourheteroatoms, more preferably one or two heteroatoms. The terms“heterocyclyl” and “heterocyclic” also include polycyclic ring systemshaving two or more cyclic rings in which two or more carbons are commonto two adjoining rings wherein at least one of the rings isheterocyclic, e.g., the other cyclic rings can be cycloalkyls,cycloalkenyls, aryls, heteroaryls, and/or heterocyclyls. Heterocyclylgroups include, for example, piperidine, piperazine, pyrrolidine,tetrahydropyran, tetrahydrofuran, morpholine, lactones, lactams, and thelike.

The term “heterocyclylalkyl” or “heterocycloalkyl”, as used herein,refers to an alkyl group substituted with a heterocycle group.

The term “hydrocarbyl”, as used herein, refers to a group that is bondedthrough a carbon atom that does not have a ═O or ═S substituent, andtypically has at least one carbon-hydrogen bond and a primarily carbonbackbone, but may optionally include heteroatoms. Thus, groups likemethyl, ethoxyethyl, 2-pyridyl, and trifluoromethyl are considered to behydrocarbyl for the purposes of this application, but substituents suchas acetyl (which has a ═O substituent on the linking carbon) and ethoxy(which is linked through oxygen, not carbon) are not. Hydrocarbyl groupsinclude, but are not limited to aryl, heteroaryl, carbocycle,heterocyclyl, alkyl, alkenyl, alkynyl, and combinations thereof.

The term “hydroxyalkyl”, as used herein, refers to an alkyl groupsubstituted with a hydroxy group.

The term “lower” when used in conjunction with a chemical moiety, suchas, acyl, acyloxy, alkyl, alkenyl, alkynyl, or alkoxy is meant toinclude groups where there are ten or fewer non-hydrogen atoms in thesubstituent, preferably six or fewer. A “lower alkyl”, for example,refers to an alkyl group that contains ten or fewer carbon atoms,preferably six or fewer. In certain embodiments, acyl, acyloxy, alkyl,alkenyl, alkynyl, or alkoxy substituents defined herein are respectivelylower acyl, lower acyloxy, lower alkyl, lower alkenyl, lower alkynyl, orlower alkoxy, whether they appear alone or in combination with othersubstituents, such as in the recitations hydroxyalkyl and aralkyl (inwhich case, for example, the atoms within the aryl group are not countedwhen counting the carbon atoms in the alkyl substituent).

The terms “polycyclyl”, “polycycle”, and “polycyclic” refer to two ormore rings (e.g., cycloalkyls, cycloalkenyls, aryls, heteroaryls, and/orheterocyclyls) in which two or more atoms are common to two adjoiningrings, e.g., the rings are “fused rings”. Each of the rings of thepolycycle can be substituted or unsubstituted. In certain embodiments,each ring of the polycycle contains from 3 to 10 atoms in the ring,preferably from 5 to 7.

The term “silyl” refers to a silicon moiety with three hydrocarbylmoieties attached thereto.

The term “substituted” refers to moieties having substituents replacinga hydrogen on one or more carbons of the backbone. It will be understoodthat “substitution” or “substituted with” includes the implicit provisothat such substitution is in accordance with permitted valence of thesubstituted atom and the substituent, and that the substitution resultsin a stable compound, e.g., which does not spontaneously undergotransformation such as by rearrangement, cyclization, elimination, etc.As used herein, the term “substituted” is contemplated to include allpermissible substituents of organic compounds. In a broad aspect, thepermissible substituents include acyclic and cyclic, branched andunbranched, carbocyclic and heterocyclic, aromatic and non-aromaticsubstituents of organic compounds. The permissible substituents can beone or more and the same or different for appropriate organic compounds.For purposes of this invention, the heteroatoms such as nitrogen mayhave hydrogen substituents and/or any permissible substituents oforganic compounds described herein which satisfy the valences of theheteroatoms. Substituents can include any substituents described herein,for example, a halogen, a hydroxyl, a carbonyl (such as a carboxyl, analkoxycarbonyl, a formyl, or an acyl), a thiocarbonyl (such as athioester, a thioacetate, or a thioformate), an alkoxy, a phosphoryl, aphosphate, a phosphonate, a phosphinate, an amino, an amido, an amidine,an imine, a cyano, a nitro, an azido, a sulfhydryl, an alkylthio, asulfate, a sulfonate, a sulfamoyl, a sulfonamido, a sulfonyl, aheterocyclyl, an aralkyl, or an aromatic or heteroaromatic moiety. Inpreferred embodiments, the substituents on substituted alkyls areselected from C₁₋₆ alkyl, C₃₋₆ cycloalkyl, halogen, carbonyl, cyano, orhydroxyl. In more preferred embodiments, the substituents on substitutedalkyls are selected from fluoro, carbonyl, cyano, or hydroxyl. It willbe understood by those skilled in the art that substituents canthemselves be substituted, if appropriate. Unless specifically stated as“unsubstituted,” references to chemical moieties herein are understoodto include substituted variants. For example, reference to an “aryl”group or moiety implicitly includes both substituted and unsubstitutedvariants.

The term “sulfate” is art-recognized and refers to the group —OSO₃H, ora pharmaceutically acceptable salt thereof.

The term “sulfonamide” is art-recognized and refers to the grouprepresented by the general formulae

wherein each R^(A) independently represents hydrogen or hydrocarbyl,such as alkyl, or both R^(A) taken together with the intervening atom(s)complete a heterocycle having from 4 to 8 atoms in the ring structure.

The term “sulfoxide” is art-recognized and refers to the group—S(O)—R^(A), wherein R^(A) represents a hydrocarbyl.

The term “sulfonate” is art-recognized and refers to the group SO₃H, ora pharmaceutically acceptable salt thereof.

The term “sulfone” is art-recognized and refers to the group—S(O)₂—R^(A), wherein R^(A) represents a hydrocarbyl.

The term “thioalkyl”, as used herein, refers to an alkyl groupsubstituted with a thiol group.

The term “thioester”, as used herein, refers to a group —C(O)SR^(A) or—SC(O)R^(A) wherein R^(A) represents a hydrocarbyl.

The term “thioether”, as used herein, is equivalent to an ether, whereinthe oxygen is replaced with a sulfur.

The term “urea” is art-recognized and may be represented by the generalformula

wherein each R^(A) independently represents hydrogen or a hydrocarbyl,such as alkyl, or any occurrence of R^(A) taken together with anotherand the intervening atom(s) complete a heterocycle having from 4 to 8atoms in the ring structure.

“Protecting group” refers to a group of atoms that, when attached to areactive functional group in a molecule, mask, reduce or prevent thereactivity of the functional group. Typically, a protecting group may beselectively removed as desired during the course of a synthesis.Examples of protecting groups can be found in Greene and Wuts,Protective Groups in Organic Chemistry, 3^(rd) Ed., 1999, John Wiley &Sons, NY and Harrison et al., Compendium of Synthetic Organic Methods,Vols. 1-8, 1971-1996, John Wiley & Sons, NY. Representative nitrogenprotecting groups include, but are not limited to, formyl, acetyl,trifluoroacetyl, benzyl, benzyloxycarbonyl (“CBZ”), tert-butoxycarbonyl(“Boc”), trimethylsilyl (“TMS”), 2-trimethylsilyl-ethanesulfonyl(“TES”), trityl and substituted trityl groups, allyloxycarbonyl,9-fluorenylmethyloxycarbonyl (“FMOC”), nitro-veratryloxycarbonyl(“NVOC”) and the like. Representative hydroxyl protecting groupsinclude, but are not limited to, those where the hydroxyl group iseither acylated (esterified) or alkylated such as benzyl and tritylethers, as well as alkyl ethers, tetrahydropyranyl ethers, trialkylsilylethers (e.g., TMS or TIPS groups), glycol ethers, such as ethyleneglycol and propylene glycol derivatives and allyl ethers.

As used herein, a therapeutic that “prevents” or “reduces the risk ofdeveloping” a disease, disorder, or condition refers to a compound that,in a statistical sample, reduces the occurrence of the disease,disorder, or condition in the treated sample relative to an untreatedcontrol sample, or delays the onset or reduces the severity of one ormore symptoms of the disorder or condition relative to the untreatedcontrol sample.

The term “treating” includes prophylactic and/or therapeutic treatments.The term “prophylactic or therapeutic” treatment is art-recognized andincludes administration to the host of one or more of the subjectcompositions. If it is administered prior to clinical manifestation ofthe unwanted condition (e.g., disease or other unwanted state of thehost animal) then the treatment is prophylactic (i.e., it protects thehost against developing the unwanted condition), whereas if it isadministered after manifestation of the unwanted condition, thetreatment is therapeutic, (i.e., it is intended to diminish, ameliorate,or stabilize the existing unwanted condition or side effects thereof).

The phrases “conjoint administration” and “administered conjointly”refer to any form of administration of two or more different therapeuticcompounds such that the second compound is administered while thepreviously administered therapeutic compound is still effective in thebody (e.g., the two compounds are simultaneously effective in thepatient, which may include synergistic effects of the two compounds).For example, the different therapeutic compounds can be administeredeither in the same formulation or in a separate formulation, eitherconcomitantly or sequentially. In certain embodiments, the differenttherapeutic compounds can be administered within one hour, 12 hours, 24hours, 36 hours, 48 hours, 72 hours, or a week of one another. Thus, anindividual who receives such treatment can benefit from a combinedeffect of different therapeutic compounds.

The term “prodrug” is intended to encompass compounds which, underphysiologic conditions, are converted into the therapeutically activeagents of the present invention. A common method for making a prodrug isto include one or more selected moieties which are hydrolyzed underphysiologic conditions to reveal the desired molecule. In otherembodiments, the prodrug is converted by an enzymatic activity of thehost animal. For example, esters or carbonates (e.g., esters orcarbonates of alcohols or carboxylic acids) are preferred prodrugs ofthe present invention. In certain embodiments, some or all of thecompounds of the invention in a formulation represented above can bereplaced with the corresponding suitable prodrug, e.g., wherein ahydroxyl in the parent compound is presented as an ester or a carbonateor carboxylic acid present in the parent compound is presented as anester.

As used herein, “small molecules” refers to small organic or inorganicmolecules of molecular weight below about 3,000 Daltons. In general,small molecules useful for the invention have a molecular weight of lessthan 3,000 Daltons (Da). The small molecules can be, e.g., from at leastabout 100 Da to about 3,000 Da (e.g., between about 100 to about 3,000Da, about 100 to about 2500 Da, about 100 to about 2,000 Da, about 100to about 1,750 Da, about 100 to about 1,500 Da, about 100 to about 1,250Da, about 100 to about 1,000 Da, about 100 to about 750 Da, about 100 toabout 500 Da, about 200 to about 1500, about 500 to about 1000, about300 to about 1000 Da, or about 100 to about 250 Da).

In some embodiments, a “small molecule” refers to an organic, inorganic,or organometallic compound typically having a molecular weight of lessthan about 1000. In some embodiments, a small molecule is an organiccompound, with a size on the order of 1 nm. In some embodiments, smallmolecule drugs of the invention encompass oligopeptides and otherbiomolecules having a molecular weight of less than about 1000.

An “effective amount” is an amount sufficient to effect beneficial ordesired results. For example, a therapeutic amount is one that achievesthe desired therapeutic effect. This amount can be the same or differentfrom a prophylactically effective amount, which is an amount necessaryto prevent onset of disease or disease symptoms. An effective amount canbe administered in one or more administrations, applications or dosages.A therapeutically effective amount of a composition depends on thecomposition selected. The compositions can be administered from one ormore times per day to one or more times per week; including once everyother day. The skilled artisan will appreciate that certain factors mayinfluence the dosage and timing required to effectively treat a subject,including but not limited to the severity of the disease or disorder,previous treatments, the general health and/or age of the subject, andother diseases present. Moreover, treatment of a subject with atherapeutically effective amount of the compositions described hereincan include a single treatment or a series of treatments.

Compounds of the Invention

One aspect of the invention provides small molecule inhibitors of TRPC5.

In some embodiments, the compound of the invention is a compound ofstructural formula I:

or a pharmaceutically acceptable salt thereof;wherein:

“- - -” is a single bond or a double bond

X¹ is CH or N;

when “- - -” is a double bond, X² is CH or N;

when “- - -” is a single bond, X² is N(CH₃),

when X¹ is CH, X² is N or N(CH₃);

Y is —O—, —N(CH₃)—, —N(CH₂CH₂OH)—, cyclopropan-1,1-diyl, or —CH(CH₃)—; Qis 2-trifluoromethyl-4-fluorophenyl, 2-difluoromethyl-4-fluorophenyl,2-trifluoromethylphenyl, 2-methyl-4-fluorophenyl,2-chloro-4-fluorophenyl, 2-chlorophenyl,1-(benzyl)-4-methylpiperidin-3-yl, 4-trifluoromethylpyridin-3-yl,2-trifluoromethyl-6-fluorophenyl, 2-trifluoromethyl-3-cyanophenyl,2-ethyl-3-fluorophenyl, 2-chloro-3-cyanophenyl,2-trifluoromethyl-5-fluorophenyl, or 2-difluoromethylphenyl;

R³ is hydrogen, —CH₂OH, —CH(OH)—CH₂OH, —NH₂, —CH(OH)CH₃, —OCH₃, or—NH—(CH₂)₂OH; and when “- - -” is a double bond, R⁴ is absent;

and when “- - -” is a single bond, R³ and R⁴ are taken together to form═O; and

each of R⁵ and R⁶ is independently hydrogen or —CH₃,

provided that if X¹ is N, X² is N, Y is —O— or —N(CH₃)—, and Q is2-trifluoromethylphenyl, then at least one of R³, R⁵, and R⁶ is nothydrogen.

In some embodiments, the compound of the invention is a compoundrepresented by structural formula II:

or a pharmaceutically acceptable salt thereof; wherein:

R¹ is chloro, —CF₃, —CHF₂, or —CH₃;

R² is hydrogen or fluoro; and

R³ is hydrogen, —NH₂, —CH₂OH, or CH(OH)—CH₂OH.

In some embodiments, when R¹ is —CHF₂, R² is not hydrogen.

In some embodiments, the compound of the invention is selected from anyone of the following compounds, or a pharmaceutically acceptable saltthereof:

Com- pound Structure 100

101

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In some embodiments, the compound of the invention is selected from anyone of the following compounds, or a pharmaceutically acceptable saltthereof:

Compound Structure 100

101

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104

105

112

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In some embodiments, the compound of the invention is selected from anyone of the following compounds, or a pharmaceutically acceptable saltthereof:

Com- pound Structure 100

101

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104

105

114

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137

In certain embodiments, the compounds of the invention may be racemic.In certain embodiments, the compounds of the invention may be enrichedin one enantiomer. For example, a compound of the invention may havegreater than 30% ee, 40% ee, 50% ee, 60% ee, 70% ee, 80% ee, 90% ee, oreven 95% or greater ee.

The compounds of the invention have more than one stereocenter.Accordingly, the compounds of the invention may be enriched in one ormore diastereomers. For example, a compound of the invention may havegreater than 30% de, 40% de, 50% de, 60% de, 70% de, 80% de, 90% de, oreven 95% or greater de. In certain embodiments, the compounds of theinvention have substantially one isomeric configuration at one or morestereogenic centers, and have multiple isomeric configurations at theremaining stereogenic centers.

In certain embodiments, the enantiomeric excess of the stereocenter isat least 40% ee, 50% ee, 60% ee, 70% ee, 80% ee, 90% ee, 92% ee, 94% ee,95% ee, 96% ee, 98% ee or greater ee.

As used herein, single bonds drawn without stereochemistry do notindicate the stereochemistry of the compound.

As used herein, hashed or bolded non-wedge bonds indicate relative, butnot absolute, stereochemical configuration (e.g., do not distinguishbetween enantiomers of a given diastereomer).

As used herein, hashed or bolded wedge bonds indicate absolutestereochemical configuration.

In some embodiments, the invention relates to pharmaceutical compositioncomprising a compound of the invention and a pharmaceutically acceptablecarrier. In certain embodiments, a therapeutic preparation orpharmaceutical composition of the compound of the invention may beenriched to provide predominantly one enantiomer of a compound. Anenantiomerically enriched mixture may comprise, for example, at least 60mol percent of one enantiomer, or more preferably at least 75, 90, 95,or even 99 mol percent. In certain embodiments, the compound enriched inone enantiomer is substantially free of the other enantiomer, whereinsubstantially free means that the substance in question makes up lessthan 10%, or less than 5%, or less than 4%, or less than 3%, or lessthan 2%, or less than 1% as compared to the amount of the otherenantiomer, e.g., in the composition or compound mixture. For example,if a composition or compound mixture contains 98 grams of a firstenantiomer and 2 grams of a second enantiomer, it would be said tocontain 98 mol percent of the first enantiomer and only 2% of the secondenantiomer.

In certain embodiments, a therapeutic preparation or pharmaceuticalcomposition may be enriched to provide predominantly one diastereomer ofthe compound of the invention. A diastereomerically enriched mixture maycomprise, for example, at least 60 mol percent of one diastereomer, ormore preferably at least 75, 90, 95, or even 99 mol percent.

Methods of Treatment

The non-selective Ca²⁺⁻permeable Transient Receptor Potential (TRP)channels act as sensors that transduce extracellular cues to theintracellular environment in diverse cellular processes, including actinremodeling and cell migration (Greka et al., Nat Neurosci 6, 837-845,2003; Ramsey et al., Annu Rev Physiol 68, 619-647, 2006; Montell,Pflugers Arch 451, 19-28, 2005; Clapham, Nature 426, 517-524, 2003).Dynamic rearrangement of the actin cytoskeleton relies onspatiotemporally regulated Ca²′ influx (Zheng and Poo, Annu Rev Cell DevBiol 23, 375-404, 2007); Brandman and Meyer, Science 322, 390-395,2008); Collins and Meyer, Dev Cell 16, 160-161, 2009) and the smallGTPases RhoA and Rac1 serve as key modulators of these changes(Etienne-Manneville and Hall, Nature 420, 629-635, 2002); Raftopoulouand Hall, Dev Biol 265, 23-32, 2004). RhoA induces stress fiber andfocal adhesion formation, while Rac1 mediates lamellipodia formation(Etienne-Manneville and Hall, Nature 420, 629-635, 2002). The TransientReceptor Potential Cation Channel, subfamily C, member 5 (TRPC5) acts inconcert with TRPC6 to regulate Ca2+ influx, actin remodeling, and cellmotility in kidney podocytes and fibroblasts. TRPC5-mediated Ca²⁺ influxincreases Rac1 activity, whereas TRPC6-mediated Ca2+ influx promotesRhoA activity. Gene silencing of TRPC6 channels abolishes stress fibersand diminishes focal contacts, rendering a motile, migratory cellphenotype. In contrast, gene silencing of TRPC5 channels rescues stressfiber formation, rendering a contractile cell phenotype. The resultsdescribed herein unveil a conserved signaling mechanism whereby TRPC5and TRPC6 channels control a tightly regulated balance of cytoskeletaldynamics through differential coupling to Rac1 and RhoA.

Ca²⁺-dependent remodeling of the actin cytoskeleton is a dynamic processthat drives cell migration (Wei et al., Nature 457, 901-905, 2009). RhoAand Rac1 act as switches responsible for cytoskeletal rearrangements inmigrating cells (Etienne-Manneville and Hall, Nature 420, 629-635,2002); Raftopoulou and Hall, Dev Biol 265, 23-32, 2004). Activation ofRac1 mediates a motile cell phenotype, whereas RhoA activity promotes acontractile phenotype (Etienne-Manneville and Hall, Nature 420, 629-635,2002). Ca²⁺ plays a central role in small GTPase regulation (Aspenstromet al., Biochem J 377, 327-337, 2004). Spatially and temporallyrestricted flickers of Ca²⁺ are enriched near the leading edge ofmigrating cells (Wei et al., Nature 457, 901-905, 2009).Ca2+microdomains have thus joined local bursts in Rac1 activity(Gardiner et al., Curr Biol 12, 2029-2034, 2002; Machacek et al., Nature461, 99-103, 2009) as critical events at the leading edge. To date, thesources of Ca2+influx responsible for GTPase regulation remain largelyelusive. TRP (Transient Receptor Potential) channels generate time andspace-limited Ca²⁺; signals linked to cell migration in fibroblasts andneuronal growth cones0. Specifically, TRPC5 channels are knownregulators of neuronal growth cone guidance 1 and their activity inneurons is dependent on PI3K and Rac1 activity (Bezzerides et al., NatCell Biol 6, 709-720, 2004).

Podocytes are neuronal-like cells that originate from the metanephricmesenchyme of the kidney glomerulus and are essential to the formationof the kidney filtration apparatus (Somlo and Mundel, Nat Genet. 24,333-335, 2000; Fukasawa et al., J Am Soc Nephrol 20, 1491-1503, 2009).Podocytes possess an exquisitely refined repertoire of cytoskeletaladaptations to environmental cues (Somlo and Mundel, Nat Genet 24,333-335, 2000; Garg et al., Mol Cell Biol 27, 8698-8712, 2007; Verma etal., J Clin Invest 116, 1346-1359, 2006; Verma et al., J Biol Chem 278,20716-20723, 2003; Barletta et al., J Biol Chem 278, 19266-19271, 2003;Holzman et al., Kidney Int 56, 1481-1491, 1999; Ahola et al., Am JPathol 155, 907-913, 1999; Tryggvason and Wartiovaara, N Engl J Med 354,1387-1401, 2006; Schnabel and Farquhar, J Cell Biol 111, 1255-1263,1990; Kurihara et al., Proc Natl Acad Sci USA 89, 7075-7079, 1992).Early events of podocyte injury are characterized by dysregulation ofthe actin cytoskeleton (Faul et al., Trends Cell Biol 17, 428-437, 2007,Takeda et al., J Clin Invest 108, 289-301, 2001; Asanuma et al., NatCell Biol 8, 485-491, 2006) and Ca2+ homeostasis (Hunt et al., J Am SocNephrol 16, 1593-1602, 2005; Faul et al., Nat Med 14, 931-938, 2008).These changes are associated with the onset of proteinuria, the loss ofalbumin into the urinary space, and ultimately kidney failure(Tryggvason and Wartiovaara, N Engl J Med 354, 1387-1401, 2006). Thevasoactive hormone Angiotensin H induces Ca²; influx in podocytes, andprolonged treatment results in loss of stress fibers (Hsu et al., J MolMed 86, 1379-1394, 2008). While there is a recognized link between Ca2+influx and cytoskeletal reorganization, the mechanisms by which thepodocyte senses and transduces extracellular cues that modulate cellshape and motility remain elusive. TRP Canonical 6 (TRPC6) channelmutations have been linked to podocyte injury (Winn et al., Science 308,1801-1804, 2005; Reiser et al., Nat Genet 37, 739-744, 2005; Moller etal., J Am Soc Nephrol 18, 29-36, 2007; Hsu et al., Biochim Biophys Acta1772, 928-936, 2007), but little is known about the specific pathwaysthat regulate this process. Moreover, TRPC6 shares close homology withsix other members of the TRPC channel family (Ramsey et al., Annu RevPhysiol 68, 619-647, 2006; Clapham, Nature 426, 517-524, 2003). TRPC5channels antagonize TRPC6 channel activity to control a tightlyregulated balance of cytoskeletal dynamics through differential couplingto distinct small GTPases.

Proteinuria

Proteinuria is a pathological condition wherein protein is present inthe urine. Albuminuria is a type of proteinuria. Microalbuminuria occurswhen the kidney leaks small amounts of albumin into the urine. In aproperly functioning body, albumin is not normally present in urinebecause it is retained in the bloodstream by the kidneys.Microalbuminuria is diagnosed either from a 24-hour urine collection (20to 200 μg/min) or, more commonly, from elevated concentrations (30 to300 mg/L) on at least two occasions. Microalbuminuria can be aforerunner of diabetic nephropathy. An albumin level above these valuesis called macroalbuminuria. Subjects with certain conditions, e.g.,diabetic nephropathy, can progress from microalbuminuria tomacroalbuminuria and reach a nephrotic range (>3.5 g/24 hours) as kidneydisease reaches advanced stages.

Causes of Proteinuria

Proteinuria can be associated with a number of conditions, includingfocal segmental glomerulosclerosis, IgA nephropathy, diabeticnephropathy, lupus nephritis, membranoproliferative glomerulonephritis,progressive (crescentic) glomerulonephritis, and membranousglomerulonephritis.

A. Focal Segmental Glomerulosclerosis (FSGS)

Focal Segmental Glomerulosclerosis (FSGS) is a disease that attacks thekidney's filtering system (glomeruli) causing serious scarring. FSGS isone of the many causes of a disease known as Nephrotic Syndrome, whichoccurs when protein in the blood leaks into the urine (proteinuria).

Very few treatments are available for patients with FSGS. Many patientsare treated with steroid regimens, most of which have very harsh sideeffects. Some patients have shown to respond positively toimmunosuppressive drugs as well as blood pressure drugs which have shownto lower the level of protein in the urine. To date, there is nocommonly accepted effective treatment or cure and there are no FDAapproved drugs to treat FSGS. Therefore, more effective methods toreduce or inhibit proteinuria are desirable.

B. IgA Nephropathy

IgA nephropathy (also known as IgA nephritis, IgAN, Berger's disease,and synpharyngitic glomerulonephritis) is a form of glomerulonephritis(inflammation of the glomeruli of the kidney). IgA nephropathy is themost common glomerulonephritis throughout the world. Primary IgAnephropathy is characterized by deposition of the IgA antibody in theglomerulus. There are other diseases associated with glomerular IgAdeposits, the most common being Henoch-Schonlein purpura (HSP), which isconsidered by many to be a systemic form of IgA nephropathy.Henoch-Schonlein purpura presents with a characteristic purpuric skinrash, arthritis, and abdominal pain and occurs more commonly in youngadults (16-35 yrs old). HSP is associated with a more benign prognosisthan IgA nephropathy. In IgA nephropathy there is a slow progression tochronic renal failure in 25-30% of cases during a period of 20 years.

C. Diabetic Nephropathy

Diabetic nephropathy, also known as Kimmelstiel-Wilson syndrome andintercapillary glomerulonephritis, is a progressive kidney diseasecaused by angiopathy of capillaries in the kidney glomeruli. It ischaracterized by nephrotic syndrome and diffuse glomerulosclerosis. Itis due to longstanding diabetes mellitus and is a prime cause fordialysis. The earliest detectable change in the course of diabeticnephropathy is a thickening in the glomerulus. At this stage, the kidneymay start allowing more serum albumin than normal in the urine. Asdiabetic nephropathy progresses, increasing numbers of glomeruli aredestroyed by nodular glomerulosclerosis and the amount of albuminexcreted in the urine increases.

D. Lupus Nephritis

Lupus nephritis is a kidney disorder that is a complication of systemiclupus erythematosus. Lupus nephritis occurs when antibodies andcomplement build up in the kidneys, causing inflammation. It oftencauses proteinuria and may progress rapidly to renal failure. Nitrogenwaste products build up in the bloodstream. Systemic lupus erythematosuscauses various disorders of the internal structures of the kidney,including interstitial nephritis. Lupus nephritis affects approximately3 out of 10,000 people.

E. Membranoproliferative Glomerulonephritis I/II/III

Membranoproliferative glomerulonephritis is a type of glomerulonephritiscaused by deposits in the kidney glomerular mesangium and basementmembrane thickening, activating complement and damaging the glomeruli.There are three types of membranoproliferative glomerulonephritis. TypeI is caused by immune complexes depositing in the kidney and is believedto be associated with the classical complement pathway. Type II issimilar to Type 1, however, it is believed to be associated with thealternative complement pathway. Type III is very rare and it ischaracterized by a mixture of subepithelial deposits and the typicalpathological findings of Type I disease.

F. Progressive (Crescentic) Glomerulonephritis

Progressive (crescentic) glomerulonephritis (PG) is a syndrome of thekidney that, if left untreated, rapidly progresses into acute renalfailure and death within months. In 50% of cases, PG is associated withan underlying disease such as Goodpasture's syndrome, systemic lupuserythematosus, or Wegener granulomatosis; the remaining cases areidiopathic. Regardless of the underlying cause, PG involves severeinjury to the kidney's glomeruli, with many of the glomeruli containingcharacteristic crescent-shaped scars. Patients with PG have hematuria,proteinuria, and occasionally, hypertension and edema. The clinicalpicture is consistent with nephritic syndrome, although the degree ofproteinuria may occasionally exceed 3 g/24 hours, a range associatedwith nephrotic syndrome. Untreated disease may progress to decreasedurinary volume (oliguria), which is associated with poor kidneyfunction.

G. Membranous Glomerulonephritis

Membranous glomerulonephritis (MGN) is a slowly progressive disease ofthe kidney affecting mostly patients between ages of 30 and 50 years,usually Caucasian. It can develop into nephrotic syndrome. MGN is causedby circulating immune complex. Current research indicates that themajority of the immune complexes are formed via binding of antibodies toantigens in situ to the glomerular basement membrane. The said antigensmay be endogenous to the basement membrane, or deposited from systemiccirculation.

Measurement of Urine Protein Levels

Protein levels in urine can be measured using methods known in the art.Until recently, an accurate protein measurement required a 24-hour urinecollection. In a 24-hour collection, the patient urinates into acontainer, which is kept refrigerated between trips to the bathroom. Thepatient is instructed to begin collecting urine after the first trip tothe bathroom in the morning. Every drop of urine for the rest of the dayis to be collected in the container. The next morning, the patient addsthe first urination after waking and the collection is complete.

More recently, researchers have found that a single urine sample canprovide the needed information. In the newer technique, the amount ofalbumin in the urine sample is compared with the amount of creatinine, awaste product of normal muscle breakdown. The measurement is called aurine albumin-to-creatinine ratio (UACR). A urine sample containing morethan 30 milligrams of albumin for each gram of creatinine (30 mg/g) is awarning that there may be a problem. If the laboratory test exceeds 30mg/g, another UACR test should be performed 1 to 2 weeks later. If thesecond test also shows high levels of protein, the person has persistentproteinuria, a sign of declining kidney function, and should haveadditional tests to evaluate kidney function.

Tests that measure the amount of creatinine in the blood will also showwhether a subject's kidneys are removing wastes efficiently. Too muchcreatinine in the blood is a sign that a person has kidney damage. Aphysician can use the creatinine measurement to estimate how efficientlythe kidneys are filtering the blood. This calculation is called theestimated glomerular filtration rate, or eGFR. Chronic kidney disease ispresent when the eGFR is less than 60 milliliters per minute (mL/min).

TRPC5

TRPC is a family of transient receptor potential cation channels inanimals. TRPC5 is subtype of the TRPC family of mammalian transientreceptor potential ion channels. Three examples of TRPC5 are highlightedbelow in Table 1.

TABLE 1 The TRPC5 orthologs from three different species along withtheir GenBank Ref Seq Accession Numbers. Species Nucleic Acid Amino AcidGeneID Homo sapiens NM_012471.2 NP_036603.1 7224 Mus musculusNM_009428.2 NP_033454.1 22067 Rattus norvegicus NM_080898.2 NP_543174.1140933

Accordingly, in certain embodiments, the invention provides methods fortreating, or the reducing risk of developing, a disease or conditionselected from kidney disease, pulmonary arterial hypertension, anxiety,depression, cancer, diabetic retinopathy, or pain, comprisingadministering to a subject in need thereof a therapeutically effectiveamount of a compound of the invention (e.g., a compound of structuralformula I) or a pharmaceutical composition comprising said compound.

In some embodiments, the disease is kidney disease, anxiety, depression,cancer, or diabetic retinopathy.

In some embodiments, the disease or condition is kidney disease selectedfrom Focal Segmental Glomerulosclerosis (FSGS), Diabetic nephropathy,Alport syndrome, hypertensive kidney disease, nephrotic syndrome,steroid-resistant nephrotic syndrome, minimal change disease, membranousnephropathy, idiopathic membranous nephropathy, membranoproliferativeglomerulonephritis (MPGN), immune complex-mediated MPGN,complement-mediated MPGN, Lupus nephritis, postinfectiousglomerulonephritis, thin basement membrane disease, mesangialproliferative glomerulonephritis, amyloidosis (primary), c1qnephropathy, rapidly progressive GN, anti-GBM disease, C3glomerulonephritis, hypertensive nephrosclerosis, or IgA nephropathy. Insome embodiments, the kidney disease is proteinuric kidney disease. Insome embodiments, the kidney disease is microalbuminuria ormacroalbuminuria kidney disease.

In some embodiments, the disease or condition to be treated is pulmonaryarterial hypertension.

In some embodiments, the disease or condition to be treated is painselected from neuropathic pain and visceral pain.

In some embodiments, the disease or condition is cancer selected fromchemoresistant breast carcinoma, adriamycin-resistant breast cancer,chemoresistant colorectal cancer, medulloblastoma, and tumorangiogenesis.

The invention also provides methods of treating, or the reducing risk ofdeveloping, anxiety, or depression, or cancer, comprising administeringto a subject in need thereof a therapeutically effective amount of acompound of the invention (e.g., a compound of Formula I), or apharmaceutical composition comprising said compound.

In some embodiments, the disease or condition to be treated istransplant-related FSGS, transplant-related nephrotic syndrome,transplant-related proteinuria, cholestatic liver disease, polycystickidney disease, autosomal dominant polycystic kidney disease (ADPKD),obesity, insulin resistance, Type II diabetes, prediabetes, metabolicsyndrome, non-alcoholic fatty liver disease (NAFLD), or non-alcoholicsteatohepatitis (NASH).

Subjects to be Treated

In one aspect of the invention, a subject is selected on the basis thatthey have, or are at risk of developing, a kidney disease, pulmonaryarterial hypertension, anxiety, depression, cancer, diabeticretinopathy, or pain. In another aspect, a subject is selected on thebasis that they have, or are at risk of developing, kidney disease,anxiety, depression, cancer, or diabetic retinopathy. In another aspectof the invention, a subject is selected on the basis that they have, orare at risk of developing, pain, neuropathic pain, visceral pain,transplant-related FSGS, transplant-related nephrotic syndrome,transplant-related proteinuria, cholestatic liver disease, polycystickidney disease, autosomal dominant polycystic kidney disease (ADPKD),obesity, insulin resistance, Type II diabetes, prediabetes, metabolicsyndrome, non-alcoholic fatty liver disease (NAFLD), or non-alcoholicsteatohepatitis (NASH).

Subjects that have, or are at risk of developing, proteinuria includethose with diabetes, hypertension, or certain family backgrounds. In theUnited States, diabetes is the leading cause of end-stage renal disease(ESRD). In both type 1 and type 2 diabetes, albumin in the urine is oneof the first signs of deteriorating kidney function. As kidney functiondeclines, the amount of albumin in the urine increases. Another riskfactor for developing proteinuria is hypertension. Proteinuria in aperson with high blood pressure is an indicator of declining kidneyfunction. If the hypertension is not controlled, the person can progressto full kidney failure. African Americans are more likely thanCaucasians to have high blood pressure and to develop kidney problemsfrom it, even when their blood pressure is only mildly elevated. Othergroups at risk for proteinuria are American Indians, Hispanics/Latinos,Pacific Islander Americans, older adults, and overweight subjects.

In one aspect of the invention, a subject is selected on the basis thatthey have, or are at risk of developing proteinuria. A subject that has,or is at risk of developing, proteinuria is one having one or moresymptoms of the condition. Symptoms of proteinuria are known to those ofskill in the art and include, without limitation, large amounts ofprotein in the urine, which may cause it to look foamy in the toilet.Loss of large amounts of protein may result in edema, where swelling inthe hands, feet, abdomen, or face may occur. These are signs of largeprotein loss and indicate that kidney disease has progressed. Laboratorytesting is the only way to find out whether protein is in a subject'surine before extensive kidney damage occurs.

The methods are effective for a variety of subjects including mammals,e.g., humans and other animals, such as laboratory animals, e.g., mice,rats, rabbits, or monkeys, or domesticated and farm animals, e.g., cats,dogs, goats, sheep, pigs, cows, or horses. In some embodiments, thesubject is a mammal. In some embodiments, the subject is a human.

EXAMPLES

The invention is further described in the following examples, which donot limit the scope of the invention described in the claims.

Example 1. Synthesis of Compound 100

Tert-Butyl4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (400 mg, 1.48mmol, 1 equiv.) and 4-fluoro-2-(trifluoromethyl)phenol (400.6 mg, 2.22mmol, 1.5 equiv.) in acetonitrile (10 mL) was added DBU (451.5 mg, 2.97mmol, 2.00 equiv.) at room temperature. The resulting mixture wasstirred for 2 h at 80° C. The reaction was monitored by LCMS. Themixture was allowed to cool down to room temperature. The resultingmixture was concentrated under reduced pressure. The resulting mixturewas extracted with DCM (3×100 mL). The combined organic layers werewashed with brine (3×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by Prep-TLC (PE/EtOAc 2:1) to afford tert-butyl4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(110 mg, 17.94%) as a brown solid.

4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(110 mg, 0.27 mmol, 1 equiv.) in DCM (4 mL) was added TFA (1 mL, 13.46mmol, 50.59 equiv.) at room temperature. The resulting mixture wasstirred for 1 h at room temperature. The reaction was monitored by LCMS.The resulting mixture was concentrated under reduced pressure. Themixture was basified to pH 8 with saturated NaHCO₃ (aq.). The resultingmixture was concentrated under reduced pressure. The residue waspurified by Prep-TLC (DCM/MeOH 12:1) to afford4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(50 mg, 59.98%) as a brown solid.

4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(50 mg, 0.16 mmol, 1 equiv.) in DIEA (2 mL) was added4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (47.5 mg, 0.19mmol, 1.19 equiv.) at room temperature. The resulting mixture wasstirred for 2 h at 100° C. The reaction was monitored by LCMS. Themixture was allowed to cool down to room temperature. The residue waspurified by Prep-TLC (PE/EtOAc 2:1) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(40 mg, 47.65%) as a brown solid.

4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(40 mg, 0.08 mmol, 1 equiv.) in DCM (4 mL) was added TFA (1 mL, 13.46mmol, 177.00 equiv.) dropwise at room temperature. The resulting mixturewas stirred for 1 h at room temperature. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Themixture was basified to pH 8 with saturated NaHCO₃ (aq.). The resultingmixture was concentrated under reduced pressure. The crude product (40mg) was purified by Prep-HPLC with the following conditions (Column:XBridge Prep OBD C18 Column 30×150 mm 5 um; Mobile Phase A:Water(10MMOL/L NH4HCO3), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min;Gradient: 18% B to 47% B in 7 min; 220 nm; Rt: 6.22 min) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(8.6 mg, 25.59%) as a white solid.

Example 2. Synthesis of Compound 140

Tert-Butyl 4-bromo-5,6,7,8-tetrahydro-1,7-naphthyridine-7-carboxylate

To a solution of 4-bromo-5,6,7,8-tetrahydro-1,7-naphthyridine (250 mg,1.173 mmol, 1 equiv.) in THF (10 mL, 123.430 mmol, 105.20 equiv.) wereadded Boc₂O (512.13 mg, 2.347 mmol, 2.00 equiv.) and TEA (474.90 mg,4.693 mmol, 4 equiv.) at 25° C. The solution was stirred at 25° C. for 2hours. The resulting mixture was concentrated under reduced pressure.The residue was purified by Prep-TLC (PE/EA 5/1) to afford tert-butyl4-bromo-5,6,7,8-tetrahydro-1,7-naphthyridine-7-carboxylate (210 mg,57.15%) as a light yellow oil.

Tert-butyl4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridine-7-carboxylate

To a solution of tert-butyl4-bromo-5,6,7,8-tetrahydro-1,7-naphthyridine-7-carboxylate (210 mg,0.671 mmol, 1 equiv.) and 4-fluoro-2-(trifluoromethyl)phenol (241.52 mg,1.341 mmol, 2 equiv.) in DMSO (10 mL) were added Cs₂CO₃ (873.86 mg,2.682 mmol, 4 equiv), 2-(dimethylamino)acetic acid (41.46 mg, 0.402mmol, 0.6 equiv.) and CuI (76.62 mg, 0.402 mmol, 0.60 equiv). Afterstirring for 4 hours at 120° C. under a nitrogen atmosphere, theresulting mixture was concentrated under reduced pressure. The residuewas purified by Prep-TLC, eluted with PE/EA (5/1) to afford tert-butyl4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridine-7-carboxylate(100 mg, 36.17%) as a light yellow solid.

4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridine

To a solution of tert-butyl4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridine-7-carboxylate(150 mg, 0.364 mmol, 1 equiv.) in DCM (10 mL, 157.300 mmol, 432.46equiv.) was added TFA (414.75 mg, 3.637 mmol, 10 equiv.) at 25° C. Thesolution was stirred at 25° C. for 2 hours. The resulting mixture wasconcentrated under reduced pressure. The residue was used the next step.

4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

A mixture of4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridine(60 mg, 0.192 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (47.86 mg, 0.192mmol, 1.00 equiv.) in DIEA (49.67 mg, 0.384 mmol, 2 equiv.) was stirredfor 2 hours at 100° C. under N₂ atmosphere. The residue was purified byPrep-TLC (PE/EA 1/1) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(100 mg, 99.15%) as a light yellow solid.

4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridin-7-yl]-2,3-dihydropyridazin-3-one

To a solution of4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(100 mg, 0.191 mmol, 1 equiv.) in DCM (10 mL, 157.300 mmol, 825.67equiv.) was added TFA (217.23 mg, 1.905 mmol, 10.00 equiv.) at 25° C.The solution was stirred at 25° C. for 2 hours. The crude product (150mg) was purified by Prep-HPLC with the following conditions (Column:XBridge Shield RP18 OBD Column 30*150 mm, 5 um; Mobile Phase A:Water (10mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min;Gradient: 20% B to 40% B in 7 min; 220 nm; Rt: 6.63 min) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5,6,7,8-tetrahydro-1,7-naphthyridin-7-yl]-2,3-dihydropyridazin-3-one(42.9 mg, 51.09%) as a white solid.

Example 3. Synthesis of Compound 120

2-Benzyl-5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridine

To a stirred mixture of2-benzyl-5-bromo-1,2,3,4-tetrahydro-2,6-naphthyridine (250 mg, 0.825mmol, 1 equiv.) and 2-(dimethylamino)acetic acid (170.05 mg, 1.649 mmol,2.00 equiv.) in DMSO (5 mL) were added4-fluoro-2-(trifluoromethyl)phenol (89.10 mg, 0.495 mmol, 0.6 equiv.)and CuI (94.22 mg, 0.495 mmol, 0.6 equiv.) at room temperature. ThenCs₂CO₃ (1074.59 mg, 3.298 mmol, 4 equiv.) was added at room temperature.The final reaction mixture was irradiated with microwave radiation for 1hours at 120° C. The reaction was monitored by LCMS. The mixture wasallowed to cool down to room temperature. The crude product was purifiedby reverse phase flash with the following conditions (Column: XBridgePrep OBD C 18 Column 30×150 mm 5 um; Mobile Phase A:Water (10 mMNH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min; Gradient:18% B to 35% B in 8 min; 220 nm; Rt: 7.12 min) to afford2-benzyl-5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridine(180 mg, 54.25%) as a brown solid.

5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridine

To a stirred solution of2-benzyl-5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridine(180 mg) in MeOH (10 mL) was added Pd/C (20 mg) at room temperatureunder nitrogen atmosphere. The resulting mixture was stirred for 5 hoursat room temperature under hydrogen atmosphere. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was purified by Prep-TLC (DCM/MeOH 12:1) to afford5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridine(100 mg) as a brown solid.

4-chloro-5-[5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridin-2-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridine(100 mg, 0.320 mmol, 1 equiv.) in DIEA (0.1 mL) was added4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (63.81 mg, 0.256mmol, 0.8 equiv.) at room temperature. The resulting mixture was stirredfor 1 hours at 90° C. The reaction was monitored by LCMS. The mixturewas allowed to cool down to room temperature. The residue was purifiedby Prep-TLC (DCM/MeOH; 12:1) to afford4-chloro-5-[5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridin-2-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(130 mg, 77.34%) as a white solid.

4-chloro-5-[5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridin-2-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridin-2-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(107 mg, 0.204 mmol, 1 equiv.) in DCM (4 mL) was added TFA (1 mL) atroom temperature. The resulting mixture was stirred for 1 hours at roomtemperature. The reaction was monitored by LCMS. The mixture wasbasified to pH 7 with saturated NaHCO3 (aq.). The resulting mixture wasconcentrated under reduced pressure. The crude product (50 mg) waspurified by Prep-HPLC with the following conditions (Column: XBridgePrep OBD C 18 Column 30×150 mm 5 um; Mobile Phase A:Water (10 mMNH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min; Gradient:30% B to 50% B in 8 min; 220 nm; Rt: 7.55 min) to afford4-chloro-5-[5-[4-fluoro-2-(trifluoromethyl)phenoxy]-1,2,3,4-tetrahydro-2,6-naphthyridin-2-yl]-2,3-dihydropyridazin-3-one(60 mg, 66.78%) as a white solid.

Example 4. Synthesis of Compound 118

Ethyl 2-(benzylamino)propanoate

To a stirred solution of benzaldehyde (8 g, 75.384 mmol, 1 equiv.) andTEA (7.63 g, 75.384 mmol, 1 equiv.) in DCE (100 mL, 1263.149 mmol, 16.76equiv.) was added TEA (7.63 g, 75.384 mmol, 1 equiv.) and NaBH(OAc)₃(31.95 g, 150.767 mmol, 2 equiv.) in portions at room temperature undernitrogen atmosphere. The mixture was stirred at rt overnight. Desiredproduct could be detected by LCMS. The resulting mixture was extractedwith DCM (2×150 mL). The combined organic layers were washed with brine(1×90 mL), dried over anhydrous Na₂SO₄. After filtration, the filtratewas concentrated under reduced pressure to afford ethyl2-(benzylamino)propanoate (12 g, 76.80%) as colorless oil.

Methyl 4-[benzyl(1-ethoxy-1-oxopropan-2-yl)amino]butanoate

To a stirred solution of ethyl 2-(benzylamino)propanoate (8 g, 38.596mmol, 1 equiv.) and methyl 4-oxobutanoate (4.48 g, 38.596 mmol, 1.00equiv.) in DCE (120 mL, 1515.779 mmol, 39.27 equiv.) was added TEA (3.91g, 38.596 mmol, 1 equiv.) and NaBH(OAc)₃ (16.36 g, 77.193 mmol, 2equiv.) in portions at room temperature under nitrogen atmosphere. Themixture was stirred at rt overnight. Desired product could be detectedby LCMS. The resulting mixture was extracted with DCM (2×150 mL). Thecombined organic layers were washed with brine (1×90 mL), dried overanhydrous Na₂SO₄. After filtration, the filtrate was concentrated underreduced pressure to afford methyl4-[benzyl(1-ethoxy-1-oxopropan-2-yl)amino]butanoate (10 g, 84.29%) ascolorless oil.

Methyl 1-benzyl-2-methyl-3-oxopiperidine-4-carboxylate

To a stirred solution of methyl4-[benzyl(1-ethoxy-1-oxopropan-2-yl)amino]butanoate (8 g, 26.026 mmol, 1equiv.) in Toluene (100 mL) was added t-BuOK (5.00 g, 52.051 mmol, 2equiv.) in portions at room temperature under nitrogen atmosphere. Themixture was stirred at 80° C. for 2 hours. Desired product was detectedby LCMS. The resulting mixture was concentrated under vacuum. Theresidue was purified by silica gel column chromatography, eluted withPE/EtOAc (5:1 to 2:1) to afford methyl1-benzyl-2-methyl-3-oxopiperidine-4-carboxylate (6.5 g, 95.57%) as awhite solid.

7-Benzyl-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-ol

To a stirred solution of methyl1-benzyl-2-methyl-3-oxopiperidine-4-carboxylate (6 g, 22.960 mmol, 1equiv.) in EtOH (80 mL, 1377.083 mmol, 59.98 equiv.) was added t-BuONa(4.41 g, 45.921 mmol, 2 equiv.) and methanimidamide hydrochloride (3.70g, 45.921 mmol, 2.00 equiv.) in portions at room temperature undernitrogen atmosphere. The mixture was stirred at 80° C. for 2 h. Desiredproduct could be detected by LCMS. The resulting mixture wasconcentrated under vacuum. The residue was purified by silica gel columnchromatography, eluted with PE/EtOAc (3:1 to 2:1) to afford7-benzyl-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-ol (5 g, 85.29%)as a white solid.

Tert-Butyl4-hydroxy-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of7-benzyl-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-ol (5 g, 19.583mmol, 1 equiv.) in EtOH (60 mL, 1032.812 mmol, 52.74 equiv.) was addedBoc₂O (8.55 g, 39.166 mmol, 2 equiv), CH₃COONa (1.81 g, 23.500 mmol, 1.2equiv), Pd(OH)₂/C (275.01 mg, 1.958 mmol, 0.1 equiv.) under nitrogenatmosphere. The mixture was hydrogenated at room temperature for 2 hunder hydrogen atmosphere, filtered through a Celite pad andconcentrated under reduced pressure to afford tert-butyl4-hydroxy-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(4.5 g, 86.61%) as white solid.

Tert-butyl4-chloro-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-hydroxy-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(4.5 g, 16.961 mmol, 1 equiv.) and PPh₃ (6.67 g, 25.442 mmol, 1.5equiv.) in DCE (60 mL, 0.606 mmol, 0.04 equiv.) was added CCl₄ (5.22 g,33.922 mmol, 2 equiv.) in portions at room temperature under nitrogenatmosphere. The mixture was stirred at 70° C. for 2 hours. Desiredproduct could be detected by LCMS. The resulting mixture wasconcentrated under vacuum. The residue was purified by silica gel columnchromatography, eluted with PE/EtOAc (7:1) to afford tert-butyl4-chloro-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (4g, 83.11%) as a white solid.

Tert-butyl4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-chloro-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (4g, 14.096 mmol, 1 equiv.) and 2-chloro-4-fluorophenol (2.07 g, 14.096mmol, 1 equiv.) in DMF (50 mL) was added K₂CO₃ (3.90 g, 28.193 mmol, 2equiv.) in portions at room temperature under nitrogen atmosphere. Themixture was stirred at 70 for 1 h. Desired product could be detected byLCMS. The resulting mixture was concentrated under vacuum. The residuewas purified by silica gel column chromatography, eluted with PE/EtOAc(1:1) to afford tert-butyl4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(4 g, 72.05%) as a white solid.

4-(2-Chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(4 g, 1 equiv.) in DCM (20 mL) was added TFA (4 mL) dropwise/in portionsat room temperature under nitrogen atmosphere. The mixture was stirredat rt for 2 h. Desired product could be detected by LCMS. The resultingmixture was concentrated under reduced pressure to afford4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(2.7 g, 90.51%) as off-white solid.

4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(1 g, 3.404 mmol, 1 equiv.) in DIEA (1 mL) was added4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (0.85 g, 3.404mmol, 1 equiv.) in portions at room temperature under nitrogenatmosphere. The mixture was stirred at 100° C. overnight. The desiredproduct could be detected by LCMS. The residue was purified by silicagel column chromatography, eluted with PE/EtOAc (1:1 to 1:2) to afford4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(1 g, 58.01%) as a white solid.

4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(1 g, 1 equiv.) in DCM (10 mL) was added TFA (2 mL) dropwise at roomtemperature under nitrogen atmosphere. Ther mixture was stirred at rtfor 1 h. Desired product could be detected by LCMS. The resultingmixture was concentrated under reduced pressure to afford4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(600 mg, 71.95%) as white solid.

4-chloro-5-[(8R-4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(250 mg, 1 equiv.) was separated by prep chiral-HPLC (Column: CHIRALPAKIG, 20*250 mm, 5 um; Mobile Phase A:Hex:DCM=3:1 (0.1% FA)-HPLC, MobilePhase B: EtOH-HPLC; Flow rate: 20 mL/min; Gradient: 15 B to 15 B in 19min; 220/254 nm; RT1:13.016; RT2:16.004) to afford4-chloro-5-[(8R)-4-(2-chloro-4-fluorophenoxy)-8-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(144 mg, 57.60%) as white solid.

Example 5. Synthesis of Compound 103

Tert-Butyl4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (800 mg,2.966 mmol, 1 equiv.) and 2-(difluoromethyl)phenyl acetate (1104.26 mg,5.932 mmol, 2.00 equiv.) in DMF (20 mL) were added K₂CO₃ (1229.72 mg,8.898 mmol, 3 equiv.) in portions at 80° C. under nitrogen atmosphere.The mixture was stirred for 2 hours. The reaction was monitored by LCMS.The reaction was quenched with Water at room temperature. The mixturewas extracted with EtOAc (3×50 mL). The combined organic layers werewashed with brine (3×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by reverse flash chromatography with the followingconditions: column, C18 silica gel; mobile phase, MeOH in water, 10% to50% gradient in 10 min; detector, UV 254 nm. to afford tert-butyl4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(900 mg, 80.41%) as off-white solid.

4-[2-(Difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(900 mg, 2.385 mmol, 1 equiv.) in DCM was added 3,3,3-trifluoropropanoicacid (3 mL, 6.00 equiv.) dropwise at room temperature. The mixture wasstirred for 1.5 hours. The reaction was monitored by TLC (PE/EtOAc10:1). The residue was basified to pH 8 with saturated NaHCO3 (aq.). Themixture was concentrated under reduced pressure. The crude product (100mg) was purified by Prep-HPLC with the following conditions to afford4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine (329mg, 49.75%) as off-white solid.

4-Chloro-5-[4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine (328mg, 1.183 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (169.05 mg, 0.679mmol, 1.00 equiv.) were added DIEA (175.43 mg, 1.357 mmol, 2.00 equiv.)in portions at 70° C. The mixture was stirred for 2 hours at 70° C. Theresidue was purified by reverse flash chromatography with the followingconditions: column, C18 silica gel; mobile phase, MeOH in water, 10% to50% gradient in 10 min; detector, UV 254 nm. to afford4-chloro-5-[4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(328 mg, 56.60%) as off-white solid.

4-Chloro-5-[4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(328 mg, 0.670 mmol, 1 equiv.) in DCM (10 mL) was added trifluoroaceticacid (3 mL) dropwise at room temperature. The mixture was concentratedunder vacuum. The product was purified by Prep-HPLC to afford4-chloro-5-[4-[2-(difluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(256.4 mg, 94.38%) as off-white solid.

Example 6. Synthesis of Compound 117 and 117a

Ethyl 4-[(1-phenylethyl)amino]pentanoste

To a stirred solution of 1-phenylethan-1-amine (25 g, 206.300 mmol, 1equiv.) and ethyl 4-oxopentanoate (29.74 g, 206.300 mmol, 1 equiv.) inDCE (400 mL, 5052.598 mmol, 24.49 equiv.) was added NaBH(OAc)₃ (65.59 g,309.449 mmol, 1.5 equiv.) in portions at 25° C. under nitrogenatmosphere. The solution was stirred at 25° C. for 2 hours. The reactionwas quenched by the addition of H₂O (400 mL) at 0° C. The resultingmixture was extracted with DCM (3×200 mL). The combined organic layerswere washed with saturated NaCl (aq.) (3×200 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The crude product was used to the next step.

Ethyl 4-[(2-ethoxy-2-oxoethyl)(1-phenylethyl)amino]pentanoate

To a stirred solution of ethyl 4-[(1-phenylethyl)amino]pentanoate (49 g,196.508 mmol, 1 equiv.) and ethyl 2-oxoacetate (40.12 g, 392.990 mmol,2.00 equiv.) in DCE (500 mL, 6315.747 mmol, 32.14 equiv.) was addedNaBH(OAc)₃ (62.47 g, 294.762 mmol, 1.5 equiv.) in portions at 25° C.under nitrogen atmosphere. The solution was stirred at 25° C. for 2hours. The reaction was quenched by the addition of H₂O (400 mL) at 0°C. The resulting mixture was extracted with DCM (3×200 mL). The combinedorganic layers were washed with saturated NaCl (aq.) (3×200 mL), driedover anhydrous Na₂SO₄. After filtration, the filtrate was concentratedunder reduced pressure. The crude product ethyl4-[(2-ethoxy-2-oxoethyl)(1-phenylethyl)amino]pentanoate (57 g, 86.47%)was used to the next step.

Ethyl 2-methyl-5-oxo-1-(1-phenylethyl)piperidine-4-carboxylate

To a solution of ethyl4-[(2-ethoxy-2-oxoethyl)(1-phenylethyl)amino]pentanoate (57 g, 169.924mmol, 1 equiv.) in Toluene (500 mL, 4699.452 mmol, 27.66 equiv.) wasadded t-BuOK (47.67 g, 424.810 mmol, 2.5 equiv.) in ports at 0° C. Themixture was stirred at 25° C. for 2 hours. The resulting mixture wasconcentrated under reduced pressure. The residue was purified by silicagel column chromatography, eluted with PE/EA (50/1 to 10/1) to affordethyl 2-methyl-5-oxo-1-(1-phenylethyl)piperidine-4-carboxylate (29 g,58.98%) as a yellow oil

7-(1-cyclohexylethyl)-6-methyl-decahydropyrido[3,4-d]pyrimidin-4-ol

To a solution of ethyl2-methyl-5-oxo-1-(1-phenylethyl)piperidine-4-carboxylate (10 g, 34.557mmol, 1 equiv.) and methanimidamide hydrochloride (4.17 g, 51.836 mmol,1.50 equiv.) in EtOH (100 mL, 1721.353 mmol, 49.81 equiv.) was addedEtONa (5.88 g, 86.393 mmol, 2.50 equiv.) in ports at 25° C. The mixturewas stirred at 90° C. for 2 hours. The residue was purified by silicagel column chromatography, eluted with DCM/MeOH (20/1 to 10/1) to afford7-(1-cyclohexylethyl)-6-methyl-decahydropyrido[3,4-d]pyrimidin-4-ol (3.4g, 34.96%) as a yellow solid.

Tert-Butyl4-hydroxy-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of6-methyl-7-(1-phenylethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-ol (3.5g, 12.994 mmol, 1 equiv), HCOONH₄ (4.10 g, 65.022 mmol, 5.00 equiv.) andBoc₂O (8.51 g, 38.983 mmol, 3 equiv.) in EtOH (50 mL, 860.677 mmol,66.23 equiv.) was added Pd(OH)₂/C (0.36 g, 2.599 mmol, 0.2 equiv.) undernitrogen atmosphere. The mixture was hydrogenated at 70° C. for 2 hoursunder hydrogen atmosphere using a hydrogen balloon, filtered through aCelite pad and concentrated under reduced pressure. To afford tert-butyl4-hydroxy-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1.8 g, 52.21%) as a yellow solid.

Tert-Butyl4-chloro-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of tert-butyl4-hydroxy-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1.8 g, 6.784 mmol, 1 equiv.) and PPh₃ (3.56 g, 13.569 mmol, 2 equiv.)in DCE (20 mL, 252.630 mmol, 37.24 equiv.) was added CCl₄ (3.13 g,20.353 mmol, 3 equiv.) at 25° C. The mixture was stirred at 70° C. for 3hours. The resulting mixture was concentrated under reduced pressure.The residue was purified by silica gel column chromatography, elutedwith PE/EA (10/1 to 1/1) to afford tert-butyl4-chloro-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (1.1g, 57.14%) as a yellow solid.

Tert-Butyl4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of tert-butyl4-chloro-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (1.1g, 3.877 mmol, 1 equiv.) and 2-chloro-4-fluorophenol (0.85 g, 5.800mmol, 1.50 equiv.) in DMF (15 mL, 193.826 mmol, 50.00 equiv.) was addedK₂CO₃ (1.07 g, 7.753 mmol, 2 equiv.) at 25° C. The mixture was stirredat 70° C. for 1 hour. The resulting mixture was concentrated underreduced pressure. The residue was purified by silica gel columnchromatography, eluted with PE/EA (10/1 to 5/1) to afford tert-butyl4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1.2 g, 78.60%) as a yellow solid.

4-Chloro-5-[4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

A mixture of4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(800 mg, 2.724 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (678.42 mg, 2.724mmol, 1.00 equiv.) in DIEA (704.01 mg, 5.447 mmol, 2 equiv.) was stirredfor 16 hours at 100° C. under nitrogen atmosphere. The residue waspurified by Prep-TLC (PE/EA 1/1) to afford4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(530 mg, 38.43%) as a light yellow solid.

4-chloro-5-[(6R)-4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a solution of4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(530 mg, 1.047 mmol, 1 equiv.) in DCM (20 mL, 314.601 mmol, 300.57equiv.) was added TFA (1193.47 mg, 10.467 mmol, 10 equiv.) at 25° C. Thesolution was stirred at 25° C. for 2 hours. The resulting mixture wasconcentrated under reduced pressure. The crude product (600 mg) waspurified by Prep-HPLC with the following conditions (Column: XBridgeShield RP18 OBD Column 30*150 mm, 5 um; Mobile Phase A:Water (10 mMNH4HCO3), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min; Gradient:20% B to 40% B in 7 min; 220 nm; Rt: 6.63 min) to afford the racemate(200 mg). The residue (200 mg) was purified by Chiral-Prep-HPLC with thefollowing conditions: Column: CHIRALPAK IE, 2*25 cm, 5 um; Mobile PhaseA:MTBE (0.1% FA)-HPLC, Mobile Phase B: IPA-HPLC; Flow rate: 18 mL/min;Gradient: 20 B to 20 B in 15 min; 220/254 nm. Although the two isomerswere separated by this technique, the absolute orientation was notdetermined. The compound designated as4-chloro-5-[(6S)-4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(60.9 mg, 13.78%) was obtained at 9.688 min as a white solid. Thecompound designated as4-chloro-5-[(6R)-4-(2-chloro-4-fluorophenoxy)-6-methyl-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(61.5 mg, 13.92%) was obtained at 11.813 min as a white solid.

Example 7. Synthesis of Compound 134

Tert-butyl2-chloro-4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of 2-(difluoromethyl)-4-fluorophenol (5.33 g,32.879 mmol, 2.00 equiv.) and tert-butyl2,4-dichloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (5 g,16.438 mmol, 1 equiv.) in DMF (30 mL) was added NaHCO₃ (4.14 g, 49.282mmol, 3.00 equiv.) at room temperature. The solution was stirred at 70°C. for 0.5 hours. The mixture was concentrated under reduced pressure.The residue was purified by reverse phase flash chromatography with thefollowing conditions: Column: Spherical C18, 20-40 um, 330 g; MobilePhase A: Water (plus 10 mM NH4HCO3); Mobile Phase B: acetonitrile; Flowrate: 80 mL/min; Gradient: 5%-5% B, 10 min, 70% B-95% B gradient in 100min; Detector: 254 nm. The fractions containing the desired product werecollected at 92% B and concentrated under reduced pressure to affordtert-butyl2-chloro-4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(2.100 g) as off-white solid.

7-tert-Butyl 2-methyl4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-2,7-dicarboxylate

To a solution of tert-butyl2-chloro-4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(400 mg, 0.931 mmol, 1 equiv.) and TEA (188.34 mg, 1.861 mmol, 2 equiv.)in MeOH (15 mL, 370.484 mmol, 398.10 equiv.) was added Pd(PPh3)4 (107.54mg, 0.093 mmol, 0.1 equiv.) in a pressure tank. The mixture was purgedwith nitrogen for 1 hours and then was pressurized to 10 atm with carbonmonoxide at 100° C. for 16 hours. The reaction mixture was cooled toroom temperature and filtered to remove insoluble solids. The residuewas purified by reverse phase flash chromatography with the followingconditions: Column: Spherical C₁₈, 20-40 um, 330 g; Mobile Phase A:Water (plus 10 mM NH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 5%-5% B, 10 min, 35% B-65% B gradient in 20 min;Detector: 254 nm. The fractions containing the desired product werecollected at 62% B and concentrated under reduced pressure to afford7-tert-butyl 2-methyl4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-2,7-dicarboxylate(100 mg, 23.70%) as colorless oil.

Tert-butyl4-[2-(difluoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of 7-tert-butyl 2-methyl4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-2,7-dicarboxylate(100 mg, 0.221 mmol, 1 equiv.) in t-BuOH (6 mL, 63.139 mmol, 286.29equiv.) was added NaBH₄ (16.69 mg, 0.441 mmol, 2 equiv.) at roomtemperature. The solution was stirred at 70° C. for 3 hours. To themixture was added water (3 mL). The residue was purified by reversephase flash chromatography with the following conditions: Column:Spherical C 18, 20-40 um, 330 g; Mobile Phase A: Water (plus 10 mMNH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 80 mL/min; Gradient:5%-5% B, 10 min, 45% B-80% B gradient in 20 min; Detector: 254 nm. Thefractions containing the desired product were collected at 74% B andconcentrated under reduced pressure to afford tert-butyl4-[2-(difluoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(35 mg, 37.30%) as colorless oil.

[4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]methanol

To a stirred solution of tert-butyl4-[2-(difluoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(35 mg) in DCM (6 mg) was added TFA (1 mg) at room temperature. Thesolution was stirred at rt for 2 hours. The mixture was concentratedunder reduced pressure. The residue was purified by reverse phase flashchromatography with the following conditions: Column: Spherical C18,20-40 um, 330 g; Mobile Phase A: Water (plus 10 mM NH₄HCO₃); MobilePhase B: acetonitrile; Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min,25% B-55% B gradient in 20 min; Detector: 254 nm. The fractionscontaining the desired product were collected at 41% B and concentratedunder reduced pressure to afford as[4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]methanol(20 mg) as colorless oil.

4-chloro-5-[4-[2-(difuoromethyl)-4-fuorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 25 mL round-bottom flask were added[4-[2-(difluoromethyl)-4-fluorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]methanol(20 mg, 0.061 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (15.31 mg, 0.061mmol, 1 equiv.) at room temperature. To the mixture was added DIEA(15.89 mg, 0.123 mmol, 2 equiv.) at rt. The mixture was stirred at 90°C. for 2 hours. The residue was purified by reverse phase flashchromatography with the following conditions: Column: Spherical C18,20-40 um, 330 g; Mobile Phase A: Water (plus 10 mM NH₄HCO₃); MobilePhase B: acetonitrile; Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min,35% B-70% B gradient in 20 min; Detector: 254 nm. The fractionscontaining the desired product were collected at 65% B and concentratedunder reduced pressure to afford4-chloro-5-[4-[2-(difluoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(30 mg, 90.71%) as colorless oil.

4-chloro-5-[4-[2-(difuoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-[2-(difluoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(30 mg) in DCM (5 mL) was added TFA (1 mL) at room temperature. Thesolution was stirred at rt for 2 hours. The mixture was concentratedunder reduced pressure. The crude product (30 mg) was purified byPrep-HPLC with the following conditions (Column: XBridge Prep OBD C 18Column 30×150 mm 5 um; Mobile Phase A:undefined, Mobile Phase B:undefined; Flow rate: 60 mL/min; Gradient: 20% B to 40% B in 8 min; 220nm; Rt: 7.22 min) to afford4-chloro-5-[4-[2-(difluoromethyl)-4-fluorophenoxy]-2-(hydroxymethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(8.7 mg) as a white solid.

Compounds 128, 125, 114 were prepared by the methods and schemedescribed in this Example by using 2-trifluoromethylphenol,4-fluoro-2-trifluoromethylphenol and 4-fluoro-2-chlorophenolrespectively, in place of 2-(difluoromethyl)-4-fluorophenol in the firststep of the synthesis.

Example 8. Synthesis of Compound 112

Tert-butyl2-chloro-4-(2-chloro-4-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl2,4-dichloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (800 mg,2.630 mmol, 1 equiv.) and 2-chloro-4-fluorophenol (578.16 mg, 3.945mmol, 1.50 equiv.) in DMF (15 mL) was added K₂CO₃ (726.99 mg, 5.260mmol, 2.00 equiv.) in portions at rt under nitrogen atmosphere. Theresulting mixture was stirred for 0.5 hours at 70° C. under nitrogenatmosphere. The reaction was monitored by LCMS. The mixture was allowedto cool down to rt. The resulting mixture was concentrated under reducedpressure. The resulting mixture was extracted with EtOAc (3×200 mL). Thecombined organic layers were washed with brine (2×100 mL), dried overanhydrous Na₂SO₄. After filtration, the filtrate was concentrated underreduced pressure. The residue was purified by silica gel columnchromatography, eluted with PE/EtOAc (30/1 to 10/1) to afford tert-butyl2-chloro-4-(2-chloro-4-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1 g, 91.78%) as a yellow oil.

Tert-Butyl4-(2-chloro-4-fluorophenoxy)-2-[[(4-methoxyphenyl)methyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl2-chloro-4-(2-chloro-4-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(700 mg, 1.690 mmol, 1 equiv.) in THF (30 mL) was added1-(4-methoxyphenyl)methanamine (1159.02 mg, 8.449 mmol, 5.00 equiv.) inportions at rt under nitrogen atmosphere. The resulting mixture wasstirred for 16 hours at 60° C. under nitrogen atmosphere. The reactionwas monitored by LCMS. The mixture was allowed to cool down to rt. Theresulting mixture was concentrated under reduced pressure. The resultingmixture was extracted with EtOAc (3×200 mL). The combined organic layerswere washed with brine (2×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by reverse flash chromatography with the followingconditions (Column, C18 silica gel; mobile phase, acetonitrile in water,60% to 95% gradient in 20 min; detector, UV 220 nm) to afford tert-butyl4-(2-chloro-4-fluorophenoxy)-2-[[(4-methoxyphenyl)methyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(350 mg, 40.22%) as a yellow oil.

4-(2-chloro-4-fluorophenoxy)-N-[(4-methoxyphenyl)methyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-amine

To a stirred solution of tert-butyl4-(2-chloro-4-fluorophenoxy)-2-[[(4-methoxyphenyl)methyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(350 mg, 1 equiv.) in DCM (10 mL) was added TFA (1 mL) dropwise at rt.The reaction mixture was stirred for 2 hours at rt. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was basified to pH=8 with saturated NH₄HCO₃ (aq.).The resulting mixture was extracted with DCM (3×100 mL). The combinedorganic layers were washed with brine (1×100 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The residue was purified by Prep-HPLC with the followingconditions (Column: XBridge Shield RP18 OBD Column, 5 um, 19*150 mm;Mobile Phase A:Water (10 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flowrate: 25 mL/min; Gradient: 2% B to 32% B in 1 min; 220/254 nm; Rt: 7.08min) to afford4-(2-chloro-4-fluorophenoxy)-N-[(4-methoxyphenyl)methyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-amine(260 mg) as a yellow oil.

4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-2-[[(4-methoxyphenyl)methyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 50 mL round-bottom flask were added4-(2-chloro-4-fluorophenoxy)-N-[(4-methoxyphenyl)methyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-amine(260 mg, 0.627 mmol, 1 equiv),4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (156.11 mg, 0.627mmol, 1.00 equiv.) and DIEA (242.99 mg, 1.880 mmol, 3.00 equiv.) at rtunder nitrogen atmosphere. The resulting mixture was stirred for 2 hoursat 90° C. under nitrogen atmosphere. The residue was purified by reverseflash chromatography with the following conditions (Column, C 18 silicagel; mobile phase, acetonitrile in water, 50% to 85% gradient in 25 min;detector, UV 220 nm) to afford4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-2-[[(4-methoxyphenyl)methyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(350 mg, 89.00%) as a yellow solid.

5-[2-amino-4-(2-chloro-4-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-4-chloro-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-(2-chloro-4-fluorophenoxy)-2-[[(4-methoxyphenyl)methyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(200 mg) in TFA (8 mL, 107.704 mmol, 328.23 equiv). The final reactionmixture was irradiated with microwave radiation for 2 hours at 80° C.The reaction was monitored by LCMS. The resulting mixture wasconcentrated under reduced pressure. The residue was basified to pH=8with saturated NH₄HCO₃ (aq.). The resulting mixture was extracted withDCM (2×100 mL). The combined organic layers were washed with brine(1×100 mL), dried over anhydrous Na₂SO₄. After filtration, the filtratewas concentrated under reduced pressure. The residue was purified byPrep-HPLC with the following conditions (Column: XBridge Prep OBD C18Column 30×150 mm 5 um; Mobile Phase A:Water (10 mM NH4HCO3), MobilePhase B: acetonitrile; Flow rate: 60 mL/min; Gradient: 25% B to 40% B in8 min; 220 nm; Rt: 7.35 min) to afford5-[2-amino-4-(2-chloro-4-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-4-chloro-2,3-dihydropyridazin-3-one(52.4 mg) as a yellow solid.

Compounds 113, 116, and 102 were prepared by the methods and schemedescribed in this Example by using 2-chlorophenol,4-fluoro-2-trifluoromethylphenol, 2-trifluorophenol respectively, inplace of 2-chloro-4-fluorophenol in the first step of the synthesis.

Example 9. Synthesis of Compounds 129 and 130

1-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]ethan-1-one

To a mixture of tert-butyl2-chloro-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(600 mg, 1.340 mmol, 1 equiv.) and tributyl (1-ethoxyethenyl)stannane(967.80 mg, 2.680 mmol, 2.00 equiv.) in Toluene (10 mL) was addedPd(PPh₃)₄ (77.41 mg, 0.067 mmol, 0.05 equiv.) at room temperature undernitrogen atmosphere. The resulting mixture was stirred for 4 hours at110° C. The reaction was monitored by LCMS. This resulted in tert-butyl2-(1-ethoxyethenyl)-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(700 mg, 108.06%) as a yellow oil. The crude resulting mixture was usedin the next step directly without further purification. To a stirredsolution of tert-butyl2-(1-ethoxyethenyl)-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1 g, 2.068 mmol, 1 equiv.) in DCM (5 mL) was added TFA (3.33 mL, 29.239mmol, 21.70 equiv.) at room temperature. The resulting mixture wasstirred for 2 hours at room temperature. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Themixture/residue was basified to pH 8 with saturated NaHCO₃ (aq.). Theresulting mixture was concentrated under reduced pressure. The residuewas purified by reverse phase flash chromatography with the followingconditions: Column: Spherical C18, 20-40 um, 330 g; Mobile Phase A:Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 5%-5% B, 10 min, 43% B-55% B gradient in 20 min;Detector: 220 nm. The fractions containing the desired product werecollected at 50% B and concentrated under reduced pressure to afford1-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]ethan-1-one(750 mg, 102.06%) as a light yellow solid.

5-[2-Acetyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-4-chloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 50 mL round-bottom flask were added1-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]ethan-1-one(750 mg, 2.111 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (525.81 mg, 2.111mmol, 1.00 equiv.) at room temperature. To the above mixture was addedDIEA (818.47 mg, 6.333 mmol, 3.00 equiv). The resulting mixture wasstirred for 2 hours at 100° C. The reaction was monitored by LCMS. Themixture was allowed to cool down to room temperature. The residue waspurified by reverse phase flash chromatography with the followingconditions: Column: Spherical C 18, 20-40 um, 330 g; Mobile Phase A:Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 5%-5% B, 10 min, 60% B-85% B gradient in 20 min;Detector: 220 nm. The fractions containing the desired product werecollected at 80% B and concentrated under reduced pressure to afford5-[2-acetyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-4-chloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(230 mg, 19.18%) as a light yellow oil.

4-Chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-(1-hydroxyethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of5-[2-acetyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-4-chloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(230 mg, 0.405 mmol, 1 equiv.) in MeOH (10 mL) was added NaBH₄ (30.64mg, 0.810 mmol, 2.00 equiv.) in portions at 0° C. under nitrogenatmosphere. The resulting mixture was stirred for 2 hours at roomtemperature. The reaction was monitored by LCMS. The resulting mixturewas concentrated under reduced pressure. The residue was purified byPrep-TLC (PE/EtOAc 1/1) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-(1-hydroxyethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(120 mg, 51.99%) as a light yellow oil.

4-Chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-[(1S)-1-hydroxyethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-oneand4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-[(1R)-1-hydroxyethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-(1-hydroxyethyl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(120 mg, 0.211 mmol, 1 equiv.) in DCM (5 mL) was added TFA (2.00 mL,17.541 mmol, 127.89 equiv.) dropwise at room temperature. The resultingmixture was stirred for 2 hours at room temperature. The reaction wasmonitored by LCMS. The residue was basified to pH 8 with saturatedNaHCO3 (aq.). The resulting mixture was concentrated under reducedpressure. The residue was purified by reverse phase flash chromatographywith the following conditions: Column: Spherical Cis, 20-40 um, 330 g;Mobile Phase A: Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile;Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min, 40% B-80% B gradient in25 min; Detector: 220 nm. The fractions containing the desired productwere collected at 55% B and concentrated under reduced pressure. Thecrude product (50 mg) was purified by Chiral-Prep-HPLC with thefollowing conditions (Column: CHIRALPAK IE, 2*25 cm, 5 um; Mobile PhaseA:Hex (0.1% FA)-HPLC, Mobile Phase B: EtOH-HPLC; Flow rate: 16 mL/min;Gradient: 30 B to 30 B in 33 min; 220/254 nm; RT1:26.219; RT2:29.589).Although the two isomers were separated by this technique, the absoluteorientation was not determined. The compound designated as4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-[(1S)-1-hydroxyethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(27.1 mg) was obtained at 29.589 min as an off-white solid. The compounddesignated as4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-[(1R)-1-hydroxyethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(22.6 mg) was obtained at 26.219 min as an off-white solid.

Compound 119 was prepared by the methods and scheme described in thisExample using tert-butyl2-chloro-4-[4-fluoro-2-chlorophenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylateas the starting material.

Compounds 122 and 123 were prepared by the methods and scheme describedin this Example using tert-butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylateas the starting material. Again, the absolute orientation of theseseparated isomers was not determined and the designation as (S) or (R)was arbitrary.

Example 10. Synthesis of Compound 115

tert-Butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl2,4-dichloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (2 g,6.58 mmol, 1 equiv.) and 2-(trifluoromethyl)phenol (1.6 g, 9.86 mmol,1.5 equiv.) in acetonitrile (20 mL) was added DBU (2.0 g, 13.15 mmol, 2equiv.) at room temperature. The solution was stirred at rt for 4 hours.The mixture was concentrated under reduced pressure. The residue waspurified by Prep-TLC (PE/EtOAc 10:1) to afford tert-butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(700 mg, 24.77%) as colorless oil.

tert-butyl2-([2-[(tert-butyldimethylsilyl)oxy]ethyl]amino)-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of tert-butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 1.163 mmol, 1 equiv.) in THF (15 mL) was added(2-aminoethoxy)(tert-butyl)dimethylsilane (1019.89 mg, 5.816 mmol, 5.00equiv.) at room temperature under nitrogen atmosphere. The resultingmixture was stirred for 16 h at 50° C. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Theresidue was purified by Prep-TLC (PE/EtOAc 3/1) to afford tert-butyl2-([2-[(tert-butyldimethylsilyl)oxy]ethyl]amino)-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(440 mg, 66.51%) as a light yellow oil.

2-([4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]amino)ethan-1-ol

To a stirred solution of tert-butyl2-([2-[(tert-butyldimethylsilyl)oxy]ethyl]amino)-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(440 mg, 0.774 mmol, 1 equiv.) in DCM (10 mL) was added TFA (3 mL,40.389 mmol, 52.20 equiv.) at room temperature. The resulting mixturewas stirred for 2 h at room temperature. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Theresidue was purified by reverse flash chromatography with the followingconditions: column, C18 silica gel; mobile phase, ACN in water, 40% to60% gradient in 15 min; detector, UV 254 nm to afford2-([4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]amino)ethan-1-ol(220 mg) as light yellow oil.

4-chloro-5-[2-[(2-hydroxyethyl)amino]-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 50 mL round-bottom flask were added2-([4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]amino)ethan-1-ol(220 mg, 0.621 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (154.66 mg, 0.621mmol, 1.00 equiv.) at room temperature. To the above mixture was addedDIEA (240.74 mg, 1.863 mmol, 3.00 equiv). The resulting mixture wasstirred for 2 h at 100 degrees C. The reaction was monitored by LCMS.The mixture was allowed to cool down to room temperature. The residuewas purified by reverse phase flash chromatography with the followingconditions: Column: Spherical C 18, 20-40 um, 330 g; Mobile Phase A:Water (plus 5 mM NH₄HCO₃); Mobile Phase B: ACN; Flow rate: 80 mL/min;Gradient: 5%-5% B, 10 min, 45% B-60% B gradient in 20 min; Detector: 220nm. The fractions containing the desired product were collected at 55% Band concentrated under reduced pressure to afford4-chloro-5-[2-[(2-hydroxyethyl)amino]-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(210 mg, 59.66%) as a yellow solid.

4-chloro-5-[2-[(2-hydroxyethyl)amino]-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[2-[(2-hydroxyethyl)amino]-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(200 mg, 0.353 mmol, 1 equiv.) in DCM (5 mL) was added TFA (2 mL) atroom temperature. The resulting mixture was stirred for 1 h at roomtemperature. The reaction was monitored by LCMS. The mixture wasbasified to pH 8 with saturated NaHCO₃ (aq.). The resulting mixture wasconcentrated under reduced pressure. The residue was purified byPrep-HPLC with the following conditions (Column: XBridge Prep OBD C18Column 30×150 mm 5 um; Mobile Phase A:undefined, Mobile Phase B:undefined; Flow rate: 60 mL/min; Gradient: 25% B to 50% B in 8 min; 220nm; Rt: 7.67 min) to afford4-chloro-5-[2-[(2-hydroxyethyl)amino]-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(106.3 mg) as a white solid.

Example 11. Synthesis of Compounds 138 and 139

7-Benzyl-2-chloro-4-[4fluoro-2-(trifuoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of 4-fluoro-2-(trifluoromethyl)phenol (1469.32 mg,8.158 mmol, 1.20 equiv.) and7-benzyl-2,4-dichloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine (2000 mg,6.799 mmol, 1 equiv.) in DMF (20 mL) was added K₂CO₃ (1879.20 mg, 13.597mmol, 2 equiv.) at room temperature. The solution was stirred at 70° C.for 0.5 hours. The mixture was concentrated under reduced pressure. Theresidue was purified by reverse phase flash chromatography with thefollowing conditions: Column: Spherical C18, 20-40 um, 330 g; MobilePhase A: Water (plus 5 mM TFA); Mobile Phase B: acetonitrile; Flow rate:80 mL/min; Gradient: 5%-5% B, 10 min, 70% B-95% B gradient in 20 min;Detector: 254 nm. The fractions containing the desired product werecollected at 95% B and concentrated under reduced pressure to afford7-benzyl-2-chloro-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(2331 mg, 78.31%) as an off-white solid.

7-Benzyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-one

A solution of7-benzyl-2-chloro-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(2 g, 4.568 mmol, 1 equiv.) in HAc (10 mL, 174.515 mmol, 38.20 equiv.)and H2O (1 mL, 55.508 mmol, 12.15 equiv.) was stirred for 10 hours at140° C. under N2 atmosphere. The resulting mixture was concentratedunder reduced pressure. The residue was purified by Prep-TLC (PE/EA 1/1)to afford7-benzyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-one(530 mg, 27.67%) as a light yellow solid.

4-[4-Fluoro-2-(trifluoromethyl)phenoxy]-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-one

To a solution of7-benzyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-one(530 mg, 1.264 mmol, 1 equiv.) in MeOH (10 mL, 246.989 mmol, 195.44equiv.) was added Pd/C (268.98 mg, 2.528 mmol, 2 equiv.) under nitrogenatmosphere. The mixture was hydrogenated at room temperature for 4 hoursunder hydrogen atmosphere using a hydrogen balloon, filtered through aCelite pad and concentrated under reduced pressure. To afford4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-one(430 mg, 103.34%) as a light yellow solid.

4-Chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

A mixture of4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-one(430 mg, 1.306 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (357.84 mg, 1.437mmol, 1.1 equiv.) in DIEA (337.58 mg, 2.612 mmol, 2.00 equiv.) wasstirred for 2 hours at 100° C. under N2 atmosphere. The residue waspurified by Prep-TLC (PE/EA 1/1) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(210 mg, 29.67%) as a light yellow solid.

4-Chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1-methyl-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oan-2-yl)-2,3-dihydropyridazin-3-oneand4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-methoxy-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a solution of4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(90 mg, 0.166 mmol, 1 equiv.) and NaHCO₃ (27.90 mg, 0.332 mmol, 2equiv.) in DMF (10 mL, 129.218 mmol, 778.02 equiv.) was added CH₃I(47.15 mg, 0.332 mmol, 2.00 equiv.) dropwise at 0° C. under nitrogenatmosphere. The mixture was stirred at 25° C. for 16 hours. Theresulting mixture was concentrated under reduced pressure. The residuewas purified by Prep-TLC (PE/EA 0/1) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1-methyl-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(60 mg, 64.99%) and4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-methoxy-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(15 mg) as a light yellow solid.

4-Chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1-methyl-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a solution of4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1-methyl-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(60 mg, 0.108 mmol, 1 equiv.) in DCM (10 mL, 157.300 mmol, 1457.41equiv.) was added TFA (123.07 mg, 1.079 mmol, 10 equiv.) at 25° C. Theresulting mixture was concentrated under reduced pressure. The crudeproduct (100 mg) was purified by Prep-HPLC with the following conditions(Column: XBridge Shield RP18 OBD Column 30*150 mm, 5 um; Mobile PhaseA:Water (10 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60mL/min; Gradient: 20% B to 40% B in 7 min; 220 nm; Rt: 6.63 min) toafford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-1-methyl-2-oxo-1H,2H,5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(29.3 mg, 57.54%) as a white solid.

4-Chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-methoxy-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a solution of4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-methoxy-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(15 mg, 0.027 mmol, 1 equiv.) in DCM (5 mL, 78.650 mmol, 2914.83 equiv.)was added TFA (30.77 mg, 0.270 mmol, 10 equiv.) at 25° C. The resultingmixture was concentrated under reduced pressure. The crude product (20mg) was purified by Prep-HPLC with the following conditions (Column:XBridge Shield RP18 OBD Column 30*150 mm, 5 um; Mobile Phase A:Water (10mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min;Gradient: 20% B to 40% B in 7 min; 220 nm; Rt: 6.63 min) to afford4-chloro-5-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-2-methoxy-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(7.5 mg, 58.91%) as a white solid.

Example 12. Synthesis of Compound 110

Tert-Butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl2,4-dichloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (2 g,6.58 mmol, 1 equiv.) and 2-(trifluoromethyl)phenol (1.6 g, 9.86 mmol,1.5 equiv.) in acetonitrile (20 mL) was added DBU (2.0 g, 13.15 mmol, 2equiv.) at room temperature. The solution was stirred at rt for 4 hours.The mixture was concentrated under reduced pressure. The residue waspurified by Prep-TLC (PE/EtOAc 10:1) to afford tert-butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(700 mg, 24.77%) as colorless oil.

Tert-Butyl2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of tert-butyl2-chloro-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1 g, 2.327 mmol, 1 equiv.) in MeOH (20 mL, 493.978 mmol, 212.32 equiv.)was added NaOMe (0.25 g, 0.005 mmol, 2 equiv.) at 25° C. The mixture wasstirred at 25° C. for 4 hours. The resulting mixture was concentratedunder reduced pressure. The residue was purified by silica gel columnchromatography, eluted with PE/EA (10/1 to 1/1) to afford tert-butyl2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(100 mg, 10.10%) as a light yellow solid.

2-Methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a solution of tert-butyl2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(100 mg, 0.235 mmol, 1 equiv.) in DCM (10 mL) was added TFA (268.03 mg,2.351 mmol, 10 equiv.) at 25° C. The solution was stirred at 25° C. for4 hours. The resulting mixture was concentrated under reduced pressure.The crude product (150 mg) was purified by Prep-HPLC with the followingconditions (Column: XBridge Shield RP18 OBD Column 30*150 mm, 5 um;Mobile Phase A:Water (10 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flowrate: 60 mL/min; Gradient: 20% B to 40% B in 7 min; 220 nm; Rt: 6.63min) to afford2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(80 mg, 104.62%) as a light yellow solid.

4-Chloro-5-[2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

A solution of2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(80 mg, 0.246 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (61.26 mg, 0.246mmol, 1 equiv.) in DIEA (63.57 mg, 0.492 mmol, 2.00 equiv.) was stirredfor 2 hours at 100° C. under nitrogen atmosphere. The residue waspurified by silica gel column chromatography, eluted with PE/EA (5/1 to1/1) to afford4-chloro-5-[2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(120 mg, 90.71%) as a light yellow solid.

4-Chloro-5-[2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a solution of4-chloro-5-[2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(120 mg, 0.223 mmol, 1 equiv.) in DCM (5 mL, 78.650 mmol, 352.56 equiv.)was added TFA (254.36 mg, 2.231 mmol, 10.00 equiv.) at 25° C. Theresulting mixture was concentrated under reduced pressure. The crudeproduct (150 mg) was purified by Prep-HPLC with the following conditions(Column: XBridge Shield RP18 OBD Column 30*150 mm, 5 um; Mobile PhaseA:Water (10 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60mL/min; Gradient: 20% B to 40% B in 7 min; 220 nm; Rt: 6.63 min) toafford4-chloro-5-[2-methoxy-4-[2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(24.1 mg, 23.81%) as a white solid.

Example 13. Synthesis of Compound 108

Tert-Butyl4-(3-bromo-2-chlorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (500 mg,1.854 mmol, 1 equiv.) and 3-bromo-2-chlorophenol (461.46 mg, 2.224 mmol,1.20 equiv.) in DMF (10 mL) was added K₂CO₃ (512.38 mg, 3.707 mmol, 2equiv). The resulting mixture was stirred for 1 h at 70° C. The mixturewas purified by reverse flash chromatography with the followingconditions: Column:(spnerical C 18, 20-40 um, 330 g; Mobile PhaseA:Water (5 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 20% B to 60% B in 55 min; 254 nm). The fractionscontaining the desired product were collected at 40% B and concentratedunder reduced pressure. This resulted in tert-butyl4-(3-bromo-2-chlorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(300 mg, 36.72%) as an off-white solid.

Tert-Butyl4-(2-chloro-3-cyanophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-(3-bromo-2-chlorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(450 mg, 1.021 mmol, 1 equiv.) and zinc dicarbonitrile (143.87 mg, 1.225mmol, 1.20 equiv.) in DMF (5 mL) was added Pd(PPh₃)₄ (117.99 mg, 0.102mmol, 0.1 equiv).The resulting mixture was stirred for 2 hours at 120°C. under nitrogen atmosphere. The residue was purified by reverse flashchromatography with the following conditions: Column: spnerical C 18,20-40 um, 180 g; Mobile Phase A:Water (5 mM NH₄HCO₃), Mobile Phase B:acetonitrile; Flow rate: 45 mL/min; Gradient: 10% B to 60% B in 55 min;254 nm. The fractions containing the desired product were collected at40% B and concentrated under reduced pressure. This resulted intert-butyl4-(2-chloro-3-cyanophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(280 mg, 70.89%) as a light yellow solid.

2-Chloro-3-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yloxy]benzonitrile

To a stirred solution of tert-butyl4-(2-chloro-3-cyanophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(100 mg, 0.259 mmol, 1 equiv.) in DCM (3 mL) was added TFA (1 mL). Theresulting mixture was stirred for 2 hours at room temperature under airatmosphere. The resulting mixture was concentrated under reducedpressure. The mixture was basified to pH 7 with saturated NH₄HCO₃ (aq.).The mixture was purified by reverse flash chromatography with thefollowing conditions: Column: spnerical C 18, 20-40 um, 180 g; MobilePhase A:Water (5 mM NH4HCO3), Mobile Phase B: acetonitrile; Flow rate:45 mL/min; Gradient: 30% B to 60% B in 30 min; 254 nm). The fractionscontaining the desired product were collected at 45% B and concentratedunder reduced pressure. This resulted in2-chloro-3-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yloxy]benzonitrile (60mg, 80.95%) as a light yellow oil.

2-Chloro-3-([7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy)benzonitrile

To a stirred solution of tert-butyl4-(2-chloro-3-cyanophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(60 mg, 0.155 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (38.63 mg, 0.155mmol, 1.00 equiv.) in DIEA (40.09 mg, 0.310 mmol, 2 equiv).The resultingmixture was stirred for hours at 100° C. under air atmosphere. Theresidue was purified by Prep-TLC (PE/EtOAc 1:1) to afford2-chloro-3-([7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy)benzonitrile(50 mg, 64.56%) as a light yellow solid.

2-Chloro-3-[[7-(5-chloro-6-oxo-1,6-dihydropyridazin-4-yl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy]benzonitrile

To a stirred solution of2-chloro-3-([7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy)benzonitrile(50 mg, 0.100 mmol, 1 equiv.) in DCM (3 mL) was added TFA (1 mL). Theresulting mixture was stirred for 2 hours at room temperature. Theresulting mixture was concentrated under reduced pressure. The mixturewas basified to pH 7 with saturated NH₄CO₃ (aq.). The crude product waspurified by Prep-HPLC with the following conditions (Column: XBridgePrep OBD C18 Column 30×150 mm 5 um; Mobile Phase A:Water (10 mMNH4HCO3), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min; Gradient:20% B to 42% B in 8 min; 220 nm; Rt: 7.58 min) to afford2-chloro-3-[[7-(5-chloro-6-oxo-1,6-dihydropyridazin-4-yl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy]benzonitrile(14.5 mg, 34.88%) as an off-white solid.

Example 14. Synthesis of Compound 111

Tert-Butyl4-[3-bromo-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (180 mg,0.667 mmol, 1 equiv.) and 3-bromo-2-(trifluoromethyl)phenol (241.25 mg,1.001 mmol, 1.50 equiv.) in DMF (10 mL) was added Cs₂CO₃ (434.86 mg,1.335 mmol, 2.00 equiv.) in portions at rt under nitrogen atmosphere.The resulting mixture was stirred for 0.5 hours at 70° C. under nitrogenatmosphere. The reaction was monitored by LCMS. The mixture was allowedto cool down to rt. The resulting mixture was concentrated under reducedpressure. The resulting mixture was extracted with EtOAc (3×200 mL). Thecombined organic layers were washed with brine (2×100 mL), dried overanhydrous Na₂SO₄. After filtration, the filtrate was concentrated underreduced pressure. The residue was purified by reverse flashchromatography with the following conditions (Column, C18 silica gel;mobile phase, acetonitrile in water, 40% to 85% gradient in 30 min;detector, UV 220 nm) to afford tert-butyl4-[3-bromo-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(150 mg, 47.39%) as a yellow oil.

Tert-Butyl4-[3-cyano-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl4-[3-bromo-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(150 mg, 0.316 mmol, 1 equiv.) and Zn(CN)₂ (111.43 mg, 0.949 mmol, 3.00equiv.) in DMF (8 mL) was added Pd(PPh₃)₄ (36.55 mg, 0.032 mmol, 0.1equiv.) in portions at rt under nitrogen atmosphere. The final reactionmixture was irradiated with microwave radiation for 3 hours at 150° C.The reaction was monitored by LCMS. The residue was purified by reverseflash chromatography with the following conditions (Column, C18 silicagel; mobile phase, acetonitrile in water, 40% to 95% gradient in 30 min;detector, UV 220 nm) to afford tert-butyl4-[3-cyano-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(70 mg, 52.65%) as a yellow oil.

3-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yloxy]-2-(trifluoromethyl)benzonitrile

To a stirred solution of tert-butyl4-[3-cyano-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(70 mg) in DCM (10 mL) was added TFA (1 mL) dropwise at rt. The reactionmixture was stirred for 2 hours at rt. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Theresidue was basified to pH=8 with saturated NH₄HCO₃ (aq.). The resultingmixture was extracted with DCM (3×100 mL). The combined organic layerswere washed with brine (1×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by reverse flash chromatography with the followingconditions (Column, C 18 silica gel; mobile phase, acetonitrile inwater, 30% to 60% gradient in 20 min; detector, UV 220 nm) to afford3-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yloxy]-2-(trifluoromethyl)benzonitrile(40 mg) as a yellow oil.

3-([7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy)-2-(trifluoromethyl)benzonitrile

Into a 25 mL round-bottom flask were added3-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yloxy]-2-(trifluoromethyl)benzonitrile(40 mg, 0.125 mmol, 1 equiv),4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (62.22 mg, 0.250mmol, 2.00 equiv.) and DIEA (48.42 mg, 0.375 mmol, 3.00 equiv.) at rtunder nitrogen atmosphere. The resulting mixture was stirred for 16hours at 90° C. under nitrogen atmosphere. The residue was purified byPrep-TLC (PE/EtOAc=5/1) to afford3-([7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy)-2-(trifluoromethyl)benzonitrile(50 mg, 75.12%) as a yellow oil.

3-[[7-(5-Chloro-6-oxo-1,6-dihydropyridazin-4-yl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy]-2-(trifluoromethyl)benzonitrile

To a stirred solution of3-([7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy)-2-(trifluoromethyl)benzonitrile(50 mg) in DCM (10 mL) was added TFA (1 mL) dropwise at rt. The reactionmixture was stirred for 2 hours at rt. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Theresidue was basified to pH=8 with saturated NH₄HCO₃ (aq.). The resultingmixture was extracted with DCM (3×100 mL). The combined organic layerswere washed with brine (1×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by Prep-HPLC with the following conditions (Column:XBridge Prep OBD C18 Column 30×150 mm 5 um; Mobile Phase A:Water (10 mMNH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min; Gradient:25% B to 45% B in 8 min; 220 nm; Rt: 7.07 min) to afford3-[[7-(5-chloro-6-oxo-1,6-dihydropyridazin-4-yl)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]oxy]-2-(trifluoromethyl)benzonitrile(10.8 mg) as a white solid.

Example 15. Synthesis of Compounds 126 and 126a

N-[(1E)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethylidene]-4-methylbenzene-1-sulfonohydrazide

To a stirred solution of1-[4-fluoro-2-(trifluoromethyl)phenyl]ethan-1-one (2 g, 9.702 mmol, 1equiv.) in EtOH (40 mL) was added 4-methylbenzene-1-sulfonohydrazide(1.81 g, 9.719 mmol, 1.00 equiv.) in portions at rt under nitrogenatmosphere. The resulting mixture was stirred for 6 hours at 90° C.under nitrogen atmosphere. The reaction was monitored by LCMS. Themixture was allowed to cool down to rt. The resulting mixture wasconcentrated under vacuum. The residue was purified by reverse phaseflash chromatography with the following conditions: Column: SphericalC18, 20-40 um, 330 g; Mobile Phase A: Water (plus 5 mM AcOH); MobilePhase B: acetonitrile; Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min,45% B-70% B gradient in 20 min; Detector: 220 nm. The fractionscontaining the desired product were collected at 60% B and concentratedunder reduced pressure to affordN-[(1E)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethylidene]-4-methylbenzene-1-sulfonohydrazide(2.5 g, 68.83%) as a white solid.

Tert-Butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethenyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (750 mg,2.781 mmol, 1 equiv.) andN-[(1E)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethylidene]-4-methylbenzene-1-sulfonohydrazide(2081.80 mg, 5.561 mmol, 2.00 equiv.) in 1,4-dioxane (20 mL) were addedPd(acetonitrile)₂Cl₂ (72.14 mg, 0.278 mmol, 0.10 equiv), Dppf (307.18mg, 0.556 mmol, 0.2 equiv.) and t-BuOLi (489.71 mg, 6.117 mmol, 2.20equiv.) in portions at rt under nitrogen atmosphere. The final reactionmixture was irradiated with microwave radiation for 2 hours at 100° C.The reaction was monitored by LCMS. The mixture was allowed to cool downto rt. The resulting mixture was filtered, the filter cake was washedwith EtOAc (2×50 mL). The filtrate was concentrated under reducedpressure. The residue was purified by reverse phase flash chromatographywith the following conditions: Column: Spherical C 18, 20-40 um, 330 g;Mobile Phase A: Water (plus 5 mM AcOH); Mobile Phase B: acetonitrile;Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min, 50% B-90% B gradient in30 min; Detector: 220 nm. The fractions containing the desired productwere collected at 85% B and concentrated under reduced pressure toafford tert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethenyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(800 mg, 67.95%) as a brown oil.

Tert-Butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of tert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethenyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(150 mg) in 30 mL MeOH was added Pd/C (10%, 30 mg) under nitrogenatmosphere in a 100 mL round-bottom flask. The mixture was hydrogenatedat room temperature for 4 hours under hydrogen atmosphere using ahydrogen balloon, filtered through a celite pad and concentrated underreduced pressure. This resulted in tert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(150 mg) as a yellow oil.

4-[1-[4-Fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(150 mg) in DCM (10 mL) was added TFA (1 mL) dropwise at rt. Thereaction mixture was stirred for 2 hours at rt. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was basified to pH=8 with saturated NH₄HCO₃ (aq.).The resulting mixture was extracted with DCM (3×50 mL). The combinedorganic layers were washed with brine (1×30 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The residue was purified by reverse phase flash chromatographywith the following conditions: Column: Spherical C18, 20-40 um, 120 g;Mobile Phase A: Water (plus 5 mM AcOH); Mobile Phase B: acetonitrile;Flow rate: 45 mL/min; Gradient: 5%-5% B, 10 min, 40% B-58% B gradient in15 min; Detector: 254 nm. The fractions containing the desired productwere collected at 53% B and concentrated under reduced pressure toafford4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(100 mg) as a yellow oil.

4-chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 50 mL round-bottom flask were added4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(100 mg, 0.307 mmol, 1 equiv),4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (91.88 mg, 0.369mmol, 1.20 equiv.) and DIEA (119.19 mg, 0.922 mmol, 3.00 equiv.) at rtunder nitrogen atmosphere. The resulting mixture was stirred for 2 hoursat 90° C. under nitrogen atmosphere. The reaction was monitored by LCMS.The mixture was allowed to cool down to rt. The residue was purified byreverse phase flash chromatography with the following conditions:Column: Spherical C18, 20-40 um, 120 g; Mobile Phase A: Water (plus 5 mMAcOH); Mobile Phase B: acetonitrile; Flow rate: 45 mL/min; Gradient:5%-5% B, 10 min, 40% B-60% B gradient in 15 min; Detector: 220 nm. Thefractions containing the desired product were collected at 53% B andconcentrated under reduced pressure to afford4-chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(120 mg, 72.57%) as a yellow oil.

4-Chloro-5-[4-[(1S)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-oneand4-chloro-5-[4-[(1R)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(200 mg) in DCM (10 mL) was added TFA (1 mL) dropwise at rt. Thereaction mixture was stirred for 4 hours at rt. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was basified to pH=8 with saturated NH₄HCO₃ (aq.).The resulting mixture was extracted with DCM (3×100 mL). The combinedorganic layers were washed with brine (1×100 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The residue was purified by Chiral-Prep-HPLC with thefollowing conditions (Column: XBridge Prep Phenyl OBD Column 19×150 mm 5um 13 nm; Mobile Phase A: Mobile Phase B:Flow rate: 60 mL/min; Gradient:20% B to 37% B in 8 min; 220 nm; Rt: 7.97 min). Although the two isomerswere separated by this technique, the absolute orientation was notdetermined. The compound designated as4-chloro-5-[4-[(1S)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(11.8 mg) was obtained at 1.819 min as an off-white solid. The compounddesignated as4-chloro-5-[4-[(1R)-1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(13.5 mg) was obtained at 2.470 min as a white solid.

Example 16. Synthesis of Compound 133

tert-Butyl4-[methyl[(3R,4R)-4-methylpiperidin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

Into a 25 mL round-bottom flask were added(3R,4R)-1-benzyl-N,4-dimethylpiperidin-3-amine (2.43 g, 0.011 mmol, 1.50equiv.) and tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (2 g, 0.007mmol, 1 equiv.) at room temperature. To the mixture was added DIEA (1.92g, 0.015 mmol, 2.00 equiv.) at rt. The mixture was stirred at 100° C.for 2 hours. The residue was purified by Prep-TLC (PE/EtOAc 1:1) toafford tert-butyl4-[methyl[(3R,4R)-4-methylpiperidin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(670 mg, 25.00%) as an off-white solid.

(3R,4R)-1-Benzyl-N,4-dimethyl-N-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]piperidin-3-amine

To a stirred solution of tert-butyl4-[[(3R,4R)-1-benzyl-4-methylpiperidin-3-yl](methyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(413 mg, 0.914 mmol, 1 equiv.) in DCM (10 mL) was added trifluoroaceticacid (3 mL, 0.026 mmol, 6.00 equiv.) dropwise at 0° C. The mixture wasstirred for 2 hours at room temperature. The reaction was monitored byLCMS. The solution was concentrated under reduced pressure. The crudeproduct (362 mg) was purified by Prep-HPLC with the following conditions(Column: XBridge Shield RP18 OBD Column, 5 um, 19*150 mm; Mobile PhaseA:Water (10 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 30% B to 80% B in 25 min; 220 nm; Rt: 21.65 min) toafford(3R,4R)-1-benzyl-N,4-dimethyl-N-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]piperidin-3-amine(250 mg, 77.77%) as red oil.

5-(4-[[(3R,4R)-1-Benzyl-4-methylpiperidin-3-yl](methyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-4-chloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 25 mL round-bottom flask were added(3R,4R)-1-benzyl-N,4-dimethyl-N-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]piperidin-3-amine(263 mg, 0.748 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (186.38 mg, 0.748mmol, 1.00 equiv.) at room temperature. To the mixture was added DIEA(193.41 mg, 1.261 mmol, 2 equiv.) at rt. The mixture was stirred for 2hours at 100° C. The residue was purified by reverse phase flashchromatography with the following conditions: Column: Spherical C18,20-40 um, 330 g; Mobile Phase A: Water (plus 5 mM NH₄HCO₃); Mobile PhaseB: acetonitrile; Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min, 45%B-95% B gradient in 30 min; Detector: 254 nm. The fractions containingthe desired product were collected at 85% B and concentrated underreduced pressure to afford5-(4-[[(3R,4R)-1-benzyl-4-methylpiperidin-3-yl](methyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-4-chloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(245 mg, 58.04%) as an off-white solid.

5-(4-[[(3R,4R)-1-Benzyl-4-methylpiperidin-3-yl](methyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-4-chloro-2,3-dihydropyridazin-3-one

To a stirred solution of5-(4-[[(3R,4R)-1-benzyl-4-methylpiperidin-3-yl](methyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-4-chloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(88 mg, 1 equiv.) in DCM (10 mL) was added trifluoroacetic acid (3 mL,0.026 mmol, 6.00 equiv.) dropwise at 0° C. The mixture was stirred for 2hours at room temperature. The solution was concentrated under reducedpressure. The residue was purified by reverse phase flash chromatographywith the following conditions: Column: Spherical C18, 20-40 um, 330 g;Mobile Phase A: Water (plus 5 mM TFA); Mobile Phase B: acetonitrile;Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min, 33% B-95% B gradient in30 min; Detector: 254 nm. The fractions containing the desired productwere collected at 90% B and concentrated under reduced pressure toafford5-(4-[[(3R,4R)-1-benzyl-4-methylpiperidin-3-yl](methyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-4-chloro-2,3-dihydropyridazin-3-one(33.5 mg, 44.74%) as an off-white solid.

Compound 133a was prepared by the methods and scheme described in thisexample by using (3 S,4S)-1-benzyl-N,4-dimethylpiperidin-3-amine inplace of (3R,4R)-1-benzyl-N,4-dimethylpiperidin-3-amine.

Example 17. Synthesis of Compound 136

Tert-Butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

A mixture of 4-fluoro-2-(trifluoromethyl)aniline (6.64 g, 37.074 mmol, 2equiv), tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (5 g, 18.537mmol, 1 equiv), Pd(AcO)2 (0.83 g, 3.707 mmol, 0.2 equiv), XantPhos (4.29g, 7.415 mmol, 0.4 equiv.) and Cs2CO3 (12.08 g, 37.074 mmol, 2 equiv.)in 1,4-dioxane (80 mL) was stirred at 110° C. for 16 hours. The reactionmixture was filtered and the filtrate was concentrated to give the crudeproduct which was purified by silica gel column chromatography, elutedwith PE:EA (20:1 to 1:2) to afford tert-butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(5.6 g, 73.26%) as a white solid.

Tert-Butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-methoxy-2-oxoethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(3 g, 7.275 mmol, 1 equiv.) and methyl 2-bromoacetate (2.23 g, 14.578mmol, 2.00 equiv.) in DMF (30 mL) was added Cs₂CO₃ (4.74 g, 14.548 mmol,2.00 equiv.) in portions at rt under nitrogen atmosphere. The resultingmixture was stirred for 2 hours at rt. The reaction was monitored byLCMS. The resulting mixture was extracted with EtOAc (3×400 mL). Thecombined organic layers were washed with brine (2×200 mL), dried overanhydrous Na₂SO₄. After filtration, the filtrate was concentrated underreduced pressure. The residue was purified by reverse phase flashchromatography with the following conditions: Column: Spherical C18,20-40 um, 330 g; Mobile Phase A: Water (plus 5 mM TFA); Mobile Phase B:acetonitrile; Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min, 55% B-85%B gradient in 30 min; Detector: 220 nm. The fractions containing thedesired product were collected at 79% B and concentrated under reducedpressure to afford tert-butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-methoxy-2-oxoethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 14.19%) as a yellow solid.

Tert-Butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-methoxy-2-oxoethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 1.032 mmol, 1 equiv.) in THF (50 mL) was added LiAlH₄ (78.34mg, 2.064 mmol, 2.00 equiv.) in portions at −30° C. under nitrogenatmosphere. The reaction mixture was stirred for 16 hours at rt. Thereaction was monitored by LCMS. The reaction was quenched by theaddition of Water (1 mL) at −30° C. The precipitated solids werecollected by filtration and washed with MeOH (3×30 mL). The resultingmixture was concentrated under vacuum. The residue was purified byPrep-TLC (PE/EA=1/1) to afford tert-butyl4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(100 mg, 21.23%) as a yellow oil.

4-[1-[4-Fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(150 mg) in DCM (10 mL) was added TFA (1 mL) dropwise at rt. Thereaction mixture was stirred for 2 hours at rt. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was basified to pH=8 with saturated NH₄HCO₃ (aq.).The resulting mixture was extracted with DCM (3×50 mL). The combinedorganic layers were washed with brine (1×30 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The residue was purified by reverse phase flash chromatographywith the following conditions: Column: Spherical C 18, 20-40 um, 120 g;Mobile Phase A: Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile;Flow rate: 80 mL/min; Gradient: 5%-5% B, 10 min, 40% B-58% B gradient in15 min; Detector: 220 nm. The fractions containing the desired productwere collected at 53% B and concentrated under reduced pressure toafford4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(100 mg) as a yellow oil.

4-Chloro-5-(4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 50 mL round-bottom flask were added2-[[4-fluoro-2-(trifluoromethyl)phenyl]([5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl])amino]ethan-1-ol(40 mg, 0.112 mmol, 1 equiv),4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (55.92 mg, 0.224mmol, 2.00 equiv.) and DIEA (43.53 mg, 0.337 mmol, 3.00 equiv.) at rtunder nitrogen atmosphere. The resulting mixture was stirred for 2 hoursat 90° C. under nitrogen atmosphere. The reaction was monitored by LCMS.The mixture was allowed to cool down to rt. The residue was purified byreverse phase flash chromatography with the following conditions:Column: Spherical C 18, 20-40 um, 120 g; Mobile Phase A: Water (plus 5mM NH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 45 mL/min;Gradient: 5%-5% B, 10 min, 40% B-60% B gradient in 15 min; Detector: 220nm. The fractions containing the desired product were collected at 55% Band concentrated under reduced pressure to afford4-chloro-5-(4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(50 mg, 78.28%) as a yellow oil.

4-Chloro-5-(4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-(4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(50 mg) in DCM (10 mL) was added TFA (1 mL) dropwise at rt. The reactionmixture was stirred for 2 hours at rt. The reaction was monitored byLCMS. The resulting mixture was concentrated under reduced pressure. Theresidue was basified to pH=8 with saturated NH₄HCO₃ (aq.). The resultingmixture was extracted with EtOAc (2×50 mL). The combined organic layerswere washed with brine (1×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by Prep-HPLC with the following conditions (Column:XBridge Prep OBD C 18 Column 30×150 mm 5 um; Mobile Phase A:undefined,Mobile Phase B: undefined; Flow rate: 60 mL/min; Gradient: 30% B to 45%B in 8 min; 220 nm; Rt: 7.6 min) to afford4-chloro-5-(4-[[4-fluoro-2-(trifluoromethyl)phenyl](2-hydroxyethyl)amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2,3-dihydropyridazin-3-one(6.2 mg) as a white solid.

Example 18. Synthesis of Compound 132

Tert-Butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of t-BuONa (226.97 mg, 2.362 mmol, 2.00 equiv.) inDMSO (20 mL) was added Me3SiI (472.57 mg, 2.362 mmol, 2.00 equiv.) inportions at 40° C. under nitrogen atmosphere. The resulting mixture wasstirred for 0.5 hours at 40° C. under nitrogen atmosphere. Thentert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]ethenyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 1.181 mmol, 1 equiv.) in DMSO (5 mL) was dropwise at rt undernitrogen atmosphere. The resulting mixture was stirred for 1 hours at rtunder nitrogen atmosphere. The reaction was monitored by LCMS. Themixture was allowed to cool down to rt. The resulting mixture wasextracted with EtOAc (3×100 mL). The combined organic layers were washedwith brine (2×100 mL), dried over anhydrous Na₂SO₄. After filtration,the filtrate was concentrated under reduced pressure. The residue waspurified by reverse phase flash chromatography with the followingconditions: Column: Spherical C18, 20-40 um, 330 g; Mobile Phase A:Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 5%-5% B, 10 min, 55% B-80% B gradient in 25 min;Detector: 220 nm. The fractions containing the desired product werecollected at 73% B and concentrated under reduced pressure to affordtert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(240 mg, 46.46%) as a yellow oil.

4-[1-[4-Fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(240 mg, 0.549 mmol, 1 equiv.) in DCM (10 mL) was added TFA (1 mL,13.463 mmol, 24.54 equiv.) dropwise at rt. The reaction mixture wasstirred for 2 hours at rt. The reaction was monitored by LCMS. Theresulting mixture was concentrated under reduced pressure. The residuewas basified to pH=8 with saturated NH₄HCO₃ (aq.). The resulting mixturewas extracted with EtOAc (2×100 mL). The combined organic layers werewashed with brine (1×100 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure. Theresidue was purified by reverse phase flash chromatography with thefollowing conditions: Column: Spherical C18, 20-40 um, 120 g; MobilePhase A: Water (plus 5 mM AcOH); Mobile Phase B: acetonitrile; Flowrate: 45 mL/min; Gradient: 5%-5% B, 10 min, 33% B-45% B gradient in 20min; Detector: 254 nm. The fractions containing the desired product werecollected at 40% B and concentrated under reduced pressure to afford4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(150 mg, 81.05%) as a yellow oil.

4-Chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

Into a 50 mL round-bottom flask were added4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine(150 mg, 0.445 mmol, 1 equiv),4,5-dichloro-2-(oxan-2-yl)-1,2,3,6-tetrahydropyridazin-3-one (134.00 mg,0.534 mmol, 1.20 equiv.) and DIEA (172.42 mg, 1.334 mmol, 3.00 equiv.)at rt under nitrogen atmosphere. The resulting mixture was stirred for 2hours at 90° C. under nitrogen atmosphere. The reaction was monitored byLCMS. The mixture was allowed to cool down to rt. The residue waspurified by reverse phase flash chromatography with the followingconditions: Column: Spherical C 18, 20-40 um, 330 g; Mobile Phase A:Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 5%-5% B, 10 min, 40% B-60% B gradient in 15 min;Detector: 220 nm. The fractions containing the desired product werecollected at 54% B and concentrated under reduced pressure to afford4-chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(200 mg, 81.78%) as a yellow oil.

4-Chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(200 mg) in DCM (10 mL) was added TFA (2 mL) dropwise at rt. Thereaction mixture was stirred for 2 hours at rt. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was basified to pH=8 with saturated NH₄HCO₃ (aq.).The resulting mixture was extracted with EtOAc (2×100 mL). The combinedorganic layers were washed with brine (1×100 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The residue was purified by Prep-HPLC with the followingconditions (Column: XBridge Prep OBD C18 Column 30×150 mm 5 um; MobilePhase A:undefined, Mobile Phase B: undefined; Flow rate: 60 mL/min;Gradient: 30% B to 55% B in 8 min; 220 nm; Rt: 7.232 min) to afford4-chloro-5-(4-[1-[4-fluoro-2-(trifluoromethyl)phenyl]cyclopropyl]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2,3-dihydropyridazin-3-one(39.2 mg) as an off-white solid.

Example 19. Synthesis of Compound 109

Tert-Butyl4-(2-bromo-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (500 mg,1.854 mmol, 1 equiv.) and 2-bromo-3-fluorophenol (424.87 mg, 2.224 mmol,1.20 equiv.) in DMF (10 mL) was added K₂CO₃ (512.38 mg, 3.707 mmol, 2equiv).The resulting mixture was stirred for 0.5 hours at 70° C. Themixture was allowed to cool down to room temperature. The reaction wasquenched with Water at room temperature. The resulting mixture wasextracted with EtOAc (2×100 mL). The combined organic layers were washedwith brine (2×100 mL), dried over anhydrous Na₂SO₄. After filtration,the filtrate was concentrated under reduced pressure. The residue waspurified by silica gel column chromatography, eluted with PE/EtOAc (5:1)to afford tert-butyl4-(2-bromo-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 63.58%) as a white solid.

Tert-Butyl4-(2-ethenyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a solution of tert-butyl4-(2-bromo-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 1.178 mmol, 1 equiv.) and pentamethyl-1,3,2-dioxaborolane(334.72 mg, 2.357 mmol, 2.00 equiv.) in H2O (2 mL) and 1,4-dioxane (16mL) were added K₂CO₃ (325.75 mg, 2.357 mmol, 2 equiv.) and Pd(PPh₃)₄(68.09 mg, 0.059 mmol, 0.05 equiv). After stirring for overnight at 90°C. under a nitrogen atmosphere, the resulting mixture was concentratedunder reduced pressure. The residue was purified by silica gel columnchromatography, eluted with PE/EtOAc (5:1) to afford tert-butyl4-(2-ethenyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(250 mg, 57.12%) as a yellow oil.

Tert-Butyl4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred solution of tert-butyl4-(2-ethenyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(250 mg, 0.673 mmol, 1 equiv.) in MeOH (10 mL) was added Pd/C (100 mg,0.940 mmol, 1.40 equiv).The resulting mixture was stirred for 2 hours atRT under hydrogen atmosphere. The resulting mixture was filtered, thefilter cake was washed with MeOH (2×10 mL). The filtrate wasconcentrated under reduced pressure. The resulting mixture wasconcentrated under reduced pressure. This resulted in tert-butyl4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(210 mg, 0.08%) as a black oil.

4-(2-Ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine

To a stirred solution of tert-butyl4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(210 mg, 0.562 mmol, 1 equiv.) in DCM (3 mL) was added TFA (1 mL). Theresulting mixture was stirred for 2 hours at room temperature under airatmosphere. The resulting mixture was concentrated under reducedpressure. The mixture was basified to pH 8 with saturated NH₄HCO₃ (aq.).The mixture was purified by reverse flash chromatography with thefollowing conditions: Column: spnerical C 18, 20-40 um, 180 g; MobilePhase A:Water (5 mM NH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate:45 mL/min; Gradient: 25% B to 60% B in 40 min; 254 nm). The fractionscontaining the desired product were collected at 40% B and concentratedunder reduced pressure. This resulted in4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine (120 mg,78.07%) as a light yellow oil.

4-Chloro-5-[4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine (120 mg,0.439 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (109.37 mg, 0.439mmol, 1.00 equiv.) in DIEA (113.49 mg, 0.878 mmol, 2 equiv).Theresulting mixture was stirred for 2 hours at 100° C. under airatmosphere. The residue was purified by Prep-TLC (PE/EtOAc 1:1) toafford4-chloro-5-[4-(2-ethyl-3-fluorophenoxy)-56H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(100 mg, 46.87%) as a light yellow solid.

4-Chloro-5-[4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-[4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(100 mg, 0.206 mmol, 1 equiv.) in DCM (3 mL) was added TFA (1 mL). Theresulting mixture was stirred for 2 hours at room temperature. Theresulting mixture was concentrated under reduced pressure. The mixturewas basified to pH 7 with saturated NH₄HCO₃ (aq.). The crude product waspurified by Prep-HPLC with the following conditions (Column: XBridgePrep OBD C18 Column 30×150 mm 5 um; Mobile Phase A:Water (10 mMNH₄HCO₃), Mobile Phase B: acetonitrile; Flow rate: 60 mL/min; Gradient:30% B to 50% B in 8 min; 220 nm; Rt: 7.27 min) to afford4-chloro-5-[4-(2-ethyl-3-fluorophenoxy)-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2,3-dihydropyridazin-3-one(41.6 mg, 50.31%) as a white solid.

Example 20. Synthesis of Compound 127

Methyl 3-(methylamino)pyridine-4-carboxylate

To a stirred solution of 3-(methylamino)pyridine-4-carboxylic acid (11g, 72.296 mmol, 1 equiv.) in MeOH (500 mL, 12349.455 mmol, 170.82equiv.) was added SOCl₂ (43.01 g, 361.478 mmol, 5 equiv.) dropwise at 0°C. The resulting mixture was stirred for 30 hours at 70° C. The reactionwas monitored by LCMS. The mixture was allowed to cool down to roomtemperature. The resulting mixture was concentrated under reducedpressure. The residue was dissolved in ethyl acetate (50 mL). Themixture basified to pH 8 with saturated NaHCO₃ (aq.). The resultingmixture was extracted with EtOAc (2×20 mL). The combined organic layerswere washed with brine (1×30 mL), dried over anhydrous Na₂SO₄. Afterfiltration, the filtrate was concentrated under reduced pressure toafford methyl 3-(methylamino)pyridine-4-carboxylate (9 g, crude) as ayellow solid.

Methyl 3-(N-methylacetamido)pyridine-4-carboxylate

To a stirred solution of methyl 3-(methylamino)pyridine-4-carboxylate (9g, 54.158 mmol, 1 equiv.) in DCM (100 mL) were added Pyridine (21.42 g,270.791 mmol, 5 equiv.) and acetyl chloride (6.38 g, 81.237 mmol, 1.5equiv.) dropwise at room temperature. The resulting mixture was stirredfor 2 hours at room temperature. The reaction was monitored by LCMS. Thesolution was basified to pH 8 with saturated NaHCO3 (aq.). The resultingmixture was concentrated under reduced pressure. The residue waspurified by reverse phase flash with the following conditions (Column:C18 Column 330 g; Mobile Phase A:Water (10 mM NH₄HCO₃), Mobile Phase B:acetonitrile; Flow rate: 80 mL/min; Gradient: 10%0/B to 30% B in 25 min;254/220 nm) to afford methyl 3-(N-methylacetamido)pyridine-4-carboxylate(8 g, 70.94%) as a brown liquid.

4-Hydroxy-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one

To a stirred solution of methyl3-(N-methylacetamido)pyridine-4-carboxylate (6 g, 28.816 mmol, 1 equiv.)in dry 1,4-dioxane (100 mL) was added t-BuOK (6.47 g, 57.632 mmol, 2equiv.) at room temperature under nitrogen atmosphere. The resultingmixture was stirred for 1 hours at 90° C. under nitrogen atmosphere. Thereaction was monitored by LCMS. The mixture was allowed to cool down toroom temperature. The resulting mixture was concentrated under vacuum.The residue was purified by silica gel column chromatography, elutedwith DCM/MeOH (10:1) to afford4-hydroxy-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one (4.5 g, 88.64%) asa orange solid.

4-Chloro-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one

To a stirred solution of4-hydroxy-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one (4.5 g, 25.543mmol, 1 equiv.) in dry 1,4-dioxane (100 mL) was added POCl₃ (3.92 g,25.543 mmol, 1 equiv.) dropwise at room temperature. The resultingmixture was stirred for 16 hours at 90° C. The mixture was allowed tocool down to room temperature. The resulting mixture was concentratedunder reduced pressure. The residue was purified by silica gel columnchromatography, eluted with DCM/MeOH (10:1) to afford4-chloro-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one (2 g, 40.23%) as ared solid.

4-[[4-Fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one

To a stirred solution of4-chloro-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one (0.8 g, 4.111 mmol,1 equiv.) in dry 1,4-dioxane (15 mL) were added Cs2CO3 (2.68 g, 8.221mmol, 2 equiv), 4-fluoro-2-(trifluoromethyl)aniline (1.47 g, 8.221 mmol,2.00 equiv), XantPhos (0.95 g, 1.644 mmol, 0.4 equiv.) and Pd(AcO)₂(0.18 g, 0.822 mmol, 0.2 equiv.) at room temperature under nitrogenatmosphere. The final reaction mixture was irradiated with microwaveradiation for 4 hours at 110° C. The reaction was monitored by LCMS. Theresulting mixture was extracted with EtOAc (3×50 mL). The combinedorganic layers were washed with brine (1×100 mL), dried over anhydrousNa₂SO₄. After filtration, the filtrate was concentrated under reducedpressure. The residue was purified by reverse phase flash with thefollowing conditions (Column: C18 Column 330 g; Mobile Phase A:Water (10mM AcOH), Mobile Phase B: acetonitrile; Flow rate: 50 mL/min; Gradient:20% B to 40% B in 40 min; 254/220 nm) to afford4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one(1.1 g, 79.34%) as an off-white solid.

4-[[4-Fluoro-2-(trifluormethyl)phenyl]amino]1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one

To a stirred solution of4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2-dihydro-1,7-naphthyridin-2-one(1 g, 2.965 mmol, 1 equiv.) in THF (20 mL) was added PtO₂ (67.33 mg,0.296 mmol, 0.10 equiv.) at room temperature under nitrogen atmosphere.The resulting mixture was stirred for 16 hours at room temperature underhydrogen atmosphere. The reaction was monitored by LCMS. The resultingmixture was filtered, the filter cake was washed with EtOAc (3×20 mL).The filtrate was concentrated under reduced pressure. The resultingmixture was concentrated under reduced pressure. The residue waspurified by reverse phase flash with the following conditions (Column: C18 Column 330 g; Mobile Phase A:Water (10 mM AcOH), Mobile Phase B:acetonitrile; Flow rate: 80 mL/min; Gradient: 5% B to 20% B in 40 min;254/220 nm) The fractions containing the desired product were collectedat 16% B and concentrated under reduced pressure to afford4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(750 mg, 74.11%) as an off-white solid.

7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,25,6,7,8-hexahydro-1,7-naphthyridin-2-one

To a stirred mixture of4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(750 mg, 2.197 mmol, 1 equiv.) and4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (1.09 g, 4.395mmol, 2 equiv.) was added DIPEA (568.00 mg, 4.395 mmol, 2 equiv.) atroom temperature. The resulting mixture was stirred for 2 hours at 100°C. The reaction was monitored by LCMS. The residue was dissolved in DMF(10 mL). The solution was purified by reverse phase flash with thefollowing conditions (Column: C18 Column 330 g; Mobile Phase A:Water (10mM FA), Mobile Phase B: acetonitrile; Flow rate: 80 mL/min; Gradient:30% B to 50% B in 40 min; 254/220 nm). The fractions containing thedesired product were collected at 44% B and concentrated under reducedpressure to afford7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(1 g, 82.15%) as a yellow oil.

7-[5-Chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-[[4-fluoro-2-(trifluoromethyl)phenyl](methyl)amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one

To a stirred solution of7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-4-[[4-fluoro-2-(trifluoromethyl)phenyl]amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(800 mg, 1.444 mmol, 1 equiv.) in DMF (20 mL) were added Cs₂CO₃ (0.94 g,2.888 mmol, 2 equiv.) and MeI (614.96 mg, 4.333 mmol, 3 equiv.) at roomtemperature. The resulting mixture was stirred for 16 hours at roomtemperature. The reaction was monitored by LCMS. The mixture waspurified by reverse phase flash with the following conditions (Column:C18 Column 120 g; Mobile Phase A:Water (10 mM AcOH), Mobile Phase B:acetonitrile; Flow rate: 60 mL/min; Gradient: 40% B to 60% B in 40 min;254/220 nm). The fractions containing the desired product were collectedat 49% B and concentrated under reduced pressure to afford7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-4-[[4-fluoro-2-(trifluoromethyl)phenyl](methyl)amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(80 mg, 9.75%) as a yellow oil.

7-(5-Chloro-6-oxo-1,6-dihydropyridazin-4-yl)-4-1[[4-fluoro-2-(trifluoromethyl)phenyl](methyl)amino]-1-methyl-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one

To a stirred solution of7-[5-chloro-1-(oxan-2-yl)-6-oxo-1,6-dihydropyridazin-4-yl]-4-[[4-fluoro-2-(trifluoromethyl)phenyl](methyl)amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(80 mg, 0.141 mmol, 1 equiv.) in DCM (4.5 mL) was added TFA (0.5 mL,6.732 mmol, 31.07 equiv.) dropwise at room temperature. The resultingmixture was stirred for 2 hours at room temperature. The reaction wasmonitored by LCMS. The resulting mixture was concentrated under reducedpressure. The residue was basified to pH 8 with saturated NaHCO₃ (aq.).The solution was purified by reverse phase flash to afford7-(5-chloro-6-oxo-1,6-dihydropyridazin-4-yl)-4-[[4-fluoro-2-(trifluoromethyl)phenyl](methyl)amino]-1-methyl-1,2,5,6,7,8-hexahydro-1,7-naphthyridin-2-one(40 mg, 58.69%) as a white solid.

Example 21. Synthesis of Compounds 135 and 137

Tert-butyl2-chloro-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidine-7(6H)-carboxylate

To a solution of tert-butyl2,4-dichloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (5 g,16.44 mmol) in DMF (50 mL) were added 4-fluoro-2-(trifluoromethyl)phenol(4.44 g, 24.66 mmol) and added K₂CO₃ (3.41 g, 24.66 mmol) at roomtemperature. The resulting mixture was stirred for 1 hours at 70° C.After cooling to room temperature. A filtration was performed and thefiltrate was concentrated under reduced pressure. The residue waspurified by reverse phase flash chromatography with the followingconditions (Column: Spherical C18, 20-40 um, 330 g; Mobile Phase A:Water (plus 5 mM NH₄HCO₃; Mobile Phase B: acetonitrile; Flow rate: 80mL/min; Gradient: 5% in 10 min, 35% B to 45% B in 10 min; Detector: 254nm/220 nm. The fractions containing desired product were collected at44% B and concentrated under reduced pressure to afford tert-butyl2-chloro-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(6.2 g, 85%) as a white solid.

Tert-butyl4-(4-fluoro-2-(trifluoromethyl)phenoxy)-2-vinyl-5,8-dihydropyrido[3,4-d]pyrimidine-7(6H)-carboxylate

To a solution of tert-butyl2-chloro-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(500 mg, 1.12 mmol) in dioxane (10 mL) were added2-ethenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (344 mg, 2.23 mmol)and H₂O (0.5 mL, 27.75 mmol) K₂CO₃ (309 mg, 2.23 mmol) and Pd(PPh₃)₄(129 mg, 0.11 mmol). After stirring for 2 hours at 95° C. under anitrogen atmosphere, the resulting mixture was concentrated underreduced pressure. The residue was purified by Prep-TLC, eluted with 17%ethyl acetate in petroleum ether to afford tert-butyl2-ethenyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(490 mg, 99%) as a light yellow solid.

Tert-butyl2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidine-7(6H)-carboxylate

To a solution of tert-butyl2-ethenyl-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(400 mg, 0.91 mmol) in DCM (20 mL) were added4-hydroxy-4-methylmorpholin-4-ium (323 mg, 2.73 mmol) and K₂OsO₄.2H₂O(34 mg, 0.091 mmol) at room temperature. After stirring for additional 1hour, the resulting mixture was concentrated under reduced pressure andthe residue was purified by reverse phase flash chromatography with thefollowing conditions: Column: Spherical C18, 20-40 um, 120 g; MobilePhase A: Water (plus 5 mM NH₄HCO₃; Mobile Phase B: acetonitrile; Flowrate: 45 mL/min; Gradient: 5% B in 10 min, 45% B to 65% B in 15 min;Detector: 254 nm and 220 nm. The fractions containing desired productwere collected at 64% B and concentrated under reduced pressure toafford tert-butyl2-(1,2-dihydroxyethyl)-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(280 mg, 65%) as a white solid.

1-(4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-yl)ethane-1,2-diol

To a stirred solution of tert-butyl2-(1,2-dihydroxyethyl)-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(280 mg, 0.59 mmol) in DCM (4 mL) was added TFA (1 mL) at roomtemperature. The resulting mixture was stirred for 1 hours at roomtemperature. The resulting mixture was concentrated under vacuum. Theresidue was dissolved into DCM (50 mL) and washed with saturated aqueousNaHCO3 (20 mL). the organic layer was separated out and dried overanhydrous sodium sulfate. After filtration, the filtrate wasconcentrated under reduced pressure and the residue was purified byPrep-TLC with 8% methanol in dichloromethane to afford1-[4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-2-yl]ethane-1,2-diol(180 mg, 82%) as a brown solid.

4-chloro-5-(2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl)-2-(tetrahydro-2H-pyran-2-yl)pyridazin-3(2H)-one

To a stirred solution of2-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yloxy]benzaldehyde (180 mg, 0.71mmol) in DIEA (0.5 mL) was added4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (176 mg, 0.71mmol) at room temperature. The resulting mixture was stirred for 1 hoursat 90° C. After cooling to ambient temperature, the resulting mixturewas concentrated under reduced pressure. The residue was purified byPrep-TLC, eluted with 8% methanol in dichloromethane to afford4-chloro-5-(2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl)-2-(tetrahydro-2H-pyran-2-yl)pyridazin-3(2H)-one(140 mg, 43%) as a brown solid.

(S)-4-chloro-5-(2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl)pyridazin-3(2H)-oneand(R)-4-chloro-5-(2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl)pyridazin-3(2H)-one

To a solution of4-chloro-5-[2-(1,2-dihydroxyethyl)-4-[4-fluoro-2-(trifluoromethyl)phenoxy]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl]-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(150 mg, 0.27 mmol) in DCM (4 mL) was added TFA (1 mL) at roomtemperature. The resulting mixture was stirred for 1 hours at roomtemperature. The resulting mixture was concentrated under reducedpressure. The residue was purified by reverse phase flash chromatographywith the following conditions: Column: Spherical C 18, 20-40 um, 120 g;Mobile Phase A: Water (plus 5 mM NH₄HCO₃); Mobile Phase B: acetonitrile;Flow rate: 45 mL/min; Gradient: 5% B in 10 min, 45% B to 65% B in 15min; Detector: 254 nm and 220 nm. The fractions containing desiredproduct were collected at 64% B and concentrated under reduced pressureto afford the racemic product (130 mg) which was separated byPrep-Chiral-HPLC with the following conditions: Column: XBridge Prep OBDC18 Column 30×150 mm, 5 um; Mobile Phase A: Hexane, Mobile Phase B:EtOH; Flow rate: 20 mL/min; Gradient: 35% B in 10 min; Detector: 254/220nm). Although the two isomers were separated by this technique, theabsolute orientation was not determined. The fractions containingdesired product were collected and concentrated under reduced pressureto afford the product: The compound designated as(S)-4-chloro-5-(2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl)pyridazin-3(2H)-one:retention time (4.97 min) (49.5 mg, 39%) as a white solid and Thecompound designated as(R)-4-chloro-5-(2-(1,2-dihydroxyethyl)-4-(4-fluoro-2-(trifluoromethyl)phenoxy)-5,8-dihydropyrido[3,4-d]pyrimidin-7(6H)-yl)pyridazin-3(2H)-one:retention time (8.05 min) (45.7 mg, 36%) as a white solid.

Example 22. Synthesis of Compound 131

Tert-Butyl4-[[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl4-chloro-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate (500 mg,1.854 mmol, 1 equiv.) and 4-(trifluoromethyl)pyridin-3-amine (601.03 mg,3.707 mmol, 2.0 equiv.) in 1,4-dioxane (5 mL) were added Pd(AcO)₂ (83.24mg, 0.371 mmol, 0.2 equiv.) and Cs₂CO₃ (1207.95 mg, 3.707 mmol, 2.0equiv.) and XantPhos (429.04 mg, 0.741 mmol, 0.4 equiv.) at roomtemperature under nitrogen atmosphere. The resulting mixture was stirredfor 2 h at 110 degrees C. under nitrogen atmosphere. The reaction wasmonitored by LCMS. The mixture was allowed to cool down to roomtemperature. The resulting mixture was filtered, the filter cake waswashed with DCM (3×2 mL). The filtrate was concentrated under reducedpressure. The resulting mixture was concentrated under reduced pressure.The crude product was purified by reverse phase flash with the followingconditions (Column:C 18,120 g; Mobile Phase A:Water/0.05% NH4HCO3,Mobile Phase B:ACN; Flow rate:45 mL/min; Gradient: 45% B to 65% B in 15min; Detector, 254 nm and 220 nm, the desired product were collected at64% B) to afford tert-butyl4-[[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(600 mg, 81.86%) as a white solid.

Tert-butyl4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate

To a stirred mixture of tert-butyl4-[[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(1.32 g, 3.339 mmol, 1 equiv.) and Cs₂CO₃ (2.18 g, 6.677 mmol, 2.0equiv.) in DMF (10 mL) was added CH3I (0.95 g, 6.677 mmol, 2.0 equiv.)at 0° C. under nitrogen atmosphere. The resulting mixture was stirredfor 2 h at room temperature under nitrogen atmosphere. The reaction wasmonitored by LCMS. The crude product was purified by reverse phase flashwith the following conditions (Column:C 18,120 g; Mobile PhaseA:Water/0.05% NH₄HCO₃, Mobile Phase B:ACN; Flow rate:45 mL/min;Gradient: 45% B to 65% B in 15 min; Detector, 254 nm and 220 nm, thedesired product were collected at 64% B) to afford tert-butyl4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(400 mg, 29.26%) as a brown solid.

N-methyl-N-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]-4-(trifluoromethyl)pyridin-3-amine

To a stirred solution of tert-butyl4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidine-7-carboxylate(220 mg, 0.537 mmol, 1 equiv.) in DCM (4 mL) was added TFA (1 mL) atroom temperature under nitrogen atmosphere. The resulting mixture wasstirred for 1 h at room temperature. The reaction was monitored by LCMS.The resulting mixture was concentrated under reduced pressure. Themixture was basified to pH 8 with saturated NaHCO₃ (aq.). The resultingmixture was concentrated under reduced pressure. The residue waspurified by Prep-TLC (DCM/MeOH 12:1) to affordN-methyl-N-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]-4-(trifluoromethyl)pyridin-3-amine(130 mg, 78.22%) as a brown solid.

4-chloro-5-(4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one

To a stirred solution ofN-methyl-N-[5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-4-yl]-4-(trifluoromethyl)pyridin-3-amine(130 mg, 0.420 mmol, 1 equiv.) in DIEA (0.5 mg) was added4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (104.69 mg, 0.420mmol, 1.0 equiv.) at room temperature. The resulting mixture was stirredfor 1 h at 90° C. The reaction was monitored by LCMS. The mixture wasallowed to cool down to room temperature. The resulting mixture wasconcentrated under reduced pressure. The residue was purified byPrep-TLC (DCM/MeOH 12:1) to afford4-chloro-5-(4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(100 mg, 45.58%) as a brown solid.

4-chloro-5-(4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2,3-dihydropyridazin-3-one

To a stirred solution of4-chloro-5-(4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one(100 mg, 0.192 mmol, 1 equiv.) in DCM (4 mL) was added TFA (1 mL) atroom temperature. The resulting mixture was stirred for 1 h at roomtemperature. The reaction was monitored by LCMS. The resulting mixturewas concentrated under reduced pressure. The mixture was basified to pH8 with saturated NaHCO₃ (aq.). The resulting mixture was concentratedunder reduced pressure. The crude product (100 mg) was purified byPrep-HPLC with the following conditions (Column: XBridge Prep Phenyl OBDColumn 19×150 mm 5 um 13 nm; Mobile phase A: water, 5 mM NH₄HCO₃, Mobilephase B:Acetonitrile; Flow rate: 60 mL/min; Gradient: 35% B to 55% B in8 min; 220 nm; Rt: 7.13 min) to afford4-chloro-5-(4-[methyl[4-(trifluoromethyl)pyridin-3-yl]amino]-5H,6H,7H,8H-pyrido[3,4-d]pyrimidin-7-yl)-2,3-dihydropyridazin-3-one(52 mg, 61.99%) as a white solid.

Example 23. Synthesis of Intermediates A.2-(Difluoromethyl)-4-Fluorophenyl Acetate

4-Fluoro-2-formylphenyl Acetate

To a solution of 5-fluoro-2-hydroxybenzaldehyde (10 g, 71.371 mmol, 1equiv.) in Pyridine (100 mL, 1242.353 mmol, 17.41 equiv.) was addedacetyl acetate (14.57 g, 0.143 mmol, 2 equiv.) at 25° C. The solutionwas stirred at 25° C. for 30 min. The resulting solution wasconcentrated under reduced pressure. The residue was purified by silicagel column chromatography, eluted with PE/EA (100/1 to 20/1) to afford4-fluoro-2-formylphenyl acetate (12 g, 92.31%) as a light yellow oil.

2-(Difluoromethyl)-4-Fluorophenyl Acetate

To a solution of 4-fluoro-2-formylphenyl acetate (12 g, 65.880 mmol, 1equiv.) in DCM (200 mL, 3146.009 mmol, 47.75 equiv.) was added DAST(21.24 g, 131.760 mmol, 2 equiv.) at 0° C. The solution was stirred at25° C. for 4 hours. The resulting solution was quenched with water (100mL). The resulting mixture was extracted with DCM (100 mL×2). Thecombined organic layers were washed with saturated NaCl aq. (100 mL×2)dried over anhydrous Na₂SO₄. After filtration, the filtrate wasconcentrated under reduced pressure. The residue was purified by silicagel column chromatography, eluted with PE/EA (10/1 to 5/1) to afford2-(difluoromethyl)-4-fluorophenyl acetate (10 g, 74.35%) as a lightyellow oil.

B. 2-(Difluoromethyl)-4-Fluorophenol

1-Bromo-2-(difluoromethyl)-4-fluorobenzene

To a stirred solution of 2-bromo-5-fluorobenzaldehyde (10 g, 49.26 mmol,1 equiv.) in DCM (60 mL) was added DAST (15.9 g, 98.52 mmol, 2 equiv).The resulting mixture was stirred for 2 hours at −10° C. The reactionwas quenched with Water at −10° C. The resulting mixture was extractedwith EtOAc (4×30 mL). The combined organic layers were washed with brine(2×40 mL), dried over anhydrous Na₂SO₄. After filtration, the filtratewas concentrated under reduced pressure. The residue was purified bysilica gel column chromatography, eluted with PE/EtOAc (6:1) to afford1-bromo-2-(difluoromethyl)-4-fluorobenzene (8 g, 72.18%) as a lightyellow oil.

2-[2-(Difluoromethyl)-4-fluorophenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

To a solution of 1-bromo-2-(difluoromethyl)-4-fluorobenzene (31 g,137.773 mmol, 1 equiv.) and BPD (52.48 g, 206.664 mmol, 1.50 equiv.) in1,4-dioxane (300 mL, 3541.225 mmol, 25.70 equiv.) were added AcOK (27.04g, 275.546 mmol, 2 equiv.) and Pd(dppf)Cl₂.CH₂Cl₂ (5.63 g, 6.889 mmol,0.05 equiv.) at 25° C. under nitrogen atmosphere. The mixture wasstirred at 90° C. for 2 hours. The resulting mixture was concentratedunder reduced pressure. The residue was purified by silica gel columnchromatography, eluted with PE/EA (10/1) to afford2-[2-(difluoromethyl)-4-fluorophenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane(30 g, 80.03%) as a light yellow oil. The reaction was monitored by TLC.The crude was used the next step directly.

2-(Difluoromethyl)-4-fluorophenol

To a solution of2-[2-(difluoromethyl)-4-fluorophenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane(50 g, 183.776 mmol, 1 equiv.) in MeOH (300 mL, 7409.673 mmol, 40.32equiv.) and H₂O (100 mL, 5550.837 mmol, 30.20 equiv.) was added H₂O₂(30%) (50 mL, 2146.131 mmol, 11.68 equiv.) dropwise at 0° C. Thesolution was stirred at 25° C. for 3 hours. The resulting solution wasconcentrated under reduced pressure. The residue was diluted with EA(500 mL), The organic layer was washed with 3×200 mL of saturated NaCl(aq.). Combined organic layers was dried with anhydrous Na₂SO₄,concentrated under reduced pressure to afford2-(difluoromethyl)-4-fluorophenol (25 g, 83.91%) as a light yellow oil.

Example 24. TRPC4 Activity Assay

ICLN-1694 cells (HEK-TREx hTRPC4) expressing TRPC4 were generated asfollows. Commercially available HekTrex-293 cells were seeded at 0.7×10⁶cells/well in a 1×6-well plate 24 hrs prior to transfection using 2 mLcell growth media containing no antibiotics (1× DMEM/high glucose(Hyclone #SH30022.02); 10%0/fetal bovine serum (Sigma) 2 mM sodiumpyruvate, 10 mM HEPES). The human codon-optimized TRPC4 coding sequencewas cloned into pcDNA5/TO (Invitrogen; Cat No. V103320) using hygromycinas the resistance gene and the plasmid (SEQ ID NO: 1) propagated usingT-Rex-293 cells (Invitrogen; Cat No. R71007) following manufacturer'sdirections. On day 2, 2 μg of plasmid DNA plus 6 μl of Xtreme-GENE HPreagent in Optimem (200 μl total volume) was prepared and incubated for15 min at room temperature. This plasmid solution was then gentlyoverlayed dropwise onto each well and the plate was gently swirled tomix complex with the media for approximately 30 seconds. Transfectedcells were incubated at 37° C. in a 10% C02 incubator for 24 hrs. Thetransfected cells were harvested and transferred into 2×150 mm dishescontaining cell growth media with no antibiotics at 37° C.

The next day selection was initiated to generate a stable pool by addingcell growth media containing 150 μg/mL Hygromycin and 5 μg/mLBlasticidin and cells were allowed to grow. Media with the selectionagent was changed every 1-2 days as needed to remove dead cells. After 7days, the hygromycin concentration was reduced to 75 μg/mL and cellsgrowth was allowed to continue.

Single clones were selected as follows. The stable pool was diluted to10 cells/mL and seeded (100 μl/well) into 24×96 well plates (˜1cell/well) and allowed to grow for 7 days in cell growth media. Freshmedia (100 μl) was added and the cells allowed to grow for another 1-2weeks and then stored frozen or used immediately.

Compounds were made up to, or supplied as, a 10 mM stock solutiongenerally using DMSO as the vehicle. 10-point dose response curves weregenerated using the Echo-550 acoustic dispenser. Compound source plateswere made by serially diluting compound stocks to create 10 mM, 1 mM,and 0.1 mM solutions in DMSO into Echo-certified LDV plates. The Echothen serially spotted 100% DMSO stock solutions into source doseresponse plates to generate a 4-fold dilution scheme. 100% DMSO wasadded to the spotted dose response plates to bring the final volume to 5μl. 300μl of the dose response stock plate was then spotted intopre-incubation and stimulation assay plates. 50 μl of pre-incubationbuffer and 100 μl of stimulation buffer was then added to the platesresulting in a final assay test concentration range of 30 μM to 0.0001μM with a final DMSO concentration of 0.3%.

ICLN-1694 cells (HEK-TREx hTRPC4) were plated onto 384 well, blackpdl-coated microplates and maintained in cell growth media supplementedwith 1 μg/mL tetracycline the day prior to use for experiments. TRPC4expression was induced by the application of 1 μg/mL tetracycline at thetime of plating. Media was removed from the plates and 10 μl of 4 μM ofFluo-4 AM (mixed with equal volume of Pluronic F-127) in EBSS (NaCl (142mM), KCl (5.4 mM), glucose (10 mM), CaCl₂) (1.8 mM), MgCl2 (0.8 mM),HEPES (10 mM), pH 7.4) is added to the cells. Cells were incubated atroom temperature, protected from light, for 60-90 minutes. After theincubation period, the dye was removed and replaced with 10 μl of EBSS.Cell, pre-incubation and stimulation plates were loaded onto theFLIPR-II and the assay was initiated. The FLIPR measured a 10 secondbaseline and then added 101l of 2X compounds (or controls). Changes influorescence were monitored for an additional 5 minutes. After a 5minute pre-incubation, 20 μl of 2X Englerin A (with 1X compound orcontrols) was added to the cell plate. The final Engerlin A stimulationconcentration in the assay was 100 nM. After the Englerin A addition,changes in fluorescence were monitored for an additional 5 minutes.

Compound modulation of TRPC4 calcium response was determined as follows.After the Englerin A, fluorescence was monitored for a 5-minute period.The maximum relative fluorescence response (minus the control responseof 1 μM of an internal control compound known to maximally block TRPC4calcium response, the “REF INHIB” in the formula below) was captured andexported from the FLIPR.

Compound effect is calculated as % inhibition using the followingformula:

${\% \mspace{14mu} {inhibition}} = {\frac{{{RFU}\mspace{14mu} {TEST}\mspace{14mu} {AGENT}} - {{Plate}\mspace{14mu} {Average}\mspace{14mu} {RFU}\mspace{14mu} {REF}\mspace{14mu} {INHIB}}}{\begin{matrix}{{{Plate}\mspace{14mu} {Average}\mspace{14mu} {RFU}\mspace{14mu} {CONTROL}} -} \\{{Plate}\mspace{14mu} {Average}\mspace{14mu} {RFU}\mspace{14mu} {REF}\mspace{14mu} {INHIB}}\end{matrix}} \times 100}$

wherein “RFU” is the relative fluorescent units.

The results of these assays are shown in Table 2, below, wherein “A”indicates an IC₅₀ of less than or equal to 50 nM; “B” an IC₅₀ of greaterthan 50 nM and less than or equal to 500 nM; “C” an IC₅₀ of greater than500 nM and less than 1 μM; “D” an IC₅₀ of 1 μM or greater; and “NT”indicates that the compound was not tested.

Example 25. TRPC5 Activity Assay

ICLN-1633 cells (HEK-TREx hTRPC5) expressing TRPC5 were generated asfollows. Commercially available HekTrex-293 cells were seeded at 0.7×10⁶cells/well in a 1×6-well plate 24 hrs prior to transfection using 2 mLcell growth media containing no antibiotics (1× DMEM/high glucose(Hyclone #SH30022.02); 10% fetal bovine serum (Sigma) 2 mM sodiumpyruvate, 10 mM HEPES). The human TRPC5 coding sequence (NM_012471 witha silent T478C mutation) was cloned into pcDNA5/TO (Invitrogen; Cat No.V103320) using hygromycin as the resistance gene and the plasmid (SEQ IDNO:2) propagated using T-Rex-293 cells (Invitrogen; Cat No. R71007)following manufacturer's directions. On day 2, 2 μg of plasmid DNA plus6 μl of Xtreme-GENE HP reagent in Optimem (200 μl total volume) wasprepared and incubated for 15 min at room temperature. This plasmidsolution was then gently overlayed dropwise onto each well and the platewas gently swirled to mix complex with the media for approximately 30seconds. Transfected cells were incubated at 37° C. in a 10%/CO₂incubator for 24 hrs. The transfected cells were harvested andtransferred into 2×150 mm dishes containing cell growth media with noantibiotics at 37° C.

The next day selection was initiated to generate a stable pool by addingcell growth media containing 150 μg/mL Hygromycin and 5 μg/mLBlasticidin and cells were allowed to grow. Media with the selectionagent was changed every 1-2 days as needed to remove dead cells. After 7days, the hygromycin concentration was reduced to 75 μg/mL and cellsgrowth was allowed to continue.

Single clones were selected as follows. The stable pool was diluted to10 cells/mL and seeded (100 μl/well) into 24×96 well plates (˜1cell/well) and allowed to grow for 7 days in cell growth media. Freshmedia (100 μl) was added and the cells allowed to grow for another 1-2weeks and then stored frozen or used immediately.

Compounds were made up to, or supplied as a 10 mM stock solutiongenerally using DMSO as the vehicle. 10-point dose response curves weregenerated using the Echo-550 acoustic dispenser. Compound source plateswere made by serially diluting compound stocks to create 10 mM, 1 mM,and 0.1 mM solutions in DMSO into Echo certified LDV plates. The Echothen serially spotted 100%/DMSO stock solutions into source doseresponse plates to generate a 4-fold dilution scheme. 100%0/DMSO wasadded to the spotted dose response plates to bring the final volume to 5μl. 300 nl of the dose response stock plate was then spotted intopre-incubation and stimulation assay plates. 50 μl of pre-incubationbuffer and 100 μl of stimulation buffer was then added to the platesresulting in a final assay test concentration range of 30 μM to 0.0001μM with a final DMSO concentration of 0.3%.

Human ICLN-1633 cells expressing were plated onto 384 well, blackPDL-coated microplates and maintained in TRPC5 growth media the dayprior to use for experiments. TRPC5 expression was induced by theapplication of 1 μg/mL tetracycline at the time of plating. Media isremoved from the plates and 10l of 4 μM of Fluo-4 AM (mixed with equalvolume of Pluronic F-127) in EBSS is added to the cells. Cells areincubated at room temperature, protected from light, for 60-90 minutes.After the incubation period, the dye is removed and replaced with 10 μlof EBSS. Cell, pre-incubation and stimulation plates are loaded onto theFLIPR-II and the assay is initiated. The FLIPR measures a 10 secondbaseline and then adds 10 μl of 2X compounds (or controls). Changes influorescence are monitored for an additional 5 minutes. After the 5minute pre-incubation, 20l of 2X Riluzole (with 1X compound or controls)is added to the cell plate. The final Riluzole stimulation concentrationin the assay is 30 μM. After the Riluzole addition, changes influorescence are monitored for an additional 5 minutes.

Compound modulation of TRPC5 calcium response was determined as follows.After the Englerin A, fluorescence was monitored for a 5-minute period.The maximum relative fluorescence response (minus the control responseof 1 μM of an internal control compound known to maximally block TRPC5calcium response, the “REF INHIB” in the formula below) was captured andexported from the FLIPR.

Compound effect is calculated as % inhibition using the followingformula:

${\% \mspace{14mu} {inhibition}} = {\frac{{{RFU}\mspace{14mu} {TEST}\mspace{14mu} {AGENT}} - {{Plate}\mspace{14mu} {Average}\mspace{14mu} {RFU}\mspace{14mu} {REF}\mspace{14mu} {INHIB}}}{\begin{matrix}{{{Plate}\mspace{14mu} {Average}\mspace{14mu} {RFU}\mspace{14mu} {CONTROL}} -} \\{{Plate}\mspace{14mu} {Average}\mspace{14mu} {RFU}\mspace{14mu} {REF}\mspace{14mu} {INHIB}}\end{matrix}} \times 100}$

wherein “RFU” is the relative fluorescent units.

The results of these assays are shown in Table 2, below, wherein “A”indicates an IC₅₀ of less than or equal to 50 nM; “B” an IC₅₀ of greaterthan 50 nM and less than or equal to 500 nM; “C” an IC₅₀ of greater than500 nM and less than 1 μM; “D” an IC₅₀ of 1 M or greater; and “NT”indicates that the compound was not tested.

TABLE 2 TRPC4 and TRPC5 Activities of Exemplary Compounds Compound TRPC5TRPC4 100 A A 101 A A 102 A A 103 A A 104 A A 105 A A 106 A B 107 A B108 B C 109 A B 110 B A 111 B NT 112 A B 113 A B 114 A A 115 B B 116 A A117 A B 117a D NT 118 B B 119 A A 120 A A 121 A NT 122 A NT 123 B NT 124A NT 125 A NT 126 A NT 126a B NT 127 B NT 128 A NT 129 A NT 130 A NT 131A NT 132 B NT 133 B NT 133a C NT 134 A NT 135 A NT 136 A NT 137 A NT 138B NT 139 B NT 140 B NT

¹H NMR and MS data for selected compounds is provided in the tablebelow:

Com- pound Structure NMR MS 100

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.57 (s, 1H),8.04 (s, 1H), 7.79 (dd, J = 8.4, 3.0 Hz, 1H), 7.70 (s, 1H), 7.70- 7.59(m, 1H), 4.68 (s, 2H), 3.79 (t, J = 5.6 Hz, 2H), 2.98 (s, 2H). 442 101

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.54 (s, 1H),8.03 (s, 1H), 7.63 (dd, J = 8.0, 1.4 Hz, 1H), 7.51-7.40 (m, 2H), 7.36(td, J = 7.4, 2.2 Hz, 1H), 4.67 (s, 2H), 3.80 (t, J = 5.7 Hz, 2H), 3.03(t, J = 5.7 Hz, 2H). 390 102

1H NMR (400 MHz, Methanol-d4) chemical shifts 8.00 (s, 1H), 7.79- 7.67(m, 2H), 7.44 (dd, J = 13.1, 7.9 Hz, 2H), 4.51 (s, 2H), 3.87 (t, J = 5.8Hz, 2H), 2.93 (t, J = 5.6 Hz, 2H). 439 103

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.54 (s, 1H),8.04 (s, 1H), 7.71 (d, J = 7.7 Hz, 1H), 7.65 (t, J = 7.9 Hz, 1H), 7.46(t, J = 7.6 Hz, 1H), 7.40 (d, J = 8.2 Hz, 1H), 7.13 (t, J = 54.3 Hz,1H), 4.67 (s, 2H), 3.79 (t, J = 5.7 Hz, 2H), 3.03 (t, J = 5.7 Hz, 2H).406 104

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.97 (s, 1H), 8.55 (s, 1H),8.03 (s, 1H), 7.66 (dd, J = 8.3, 3.0 Hz, 1H), 7.51 (dd, J = 8.9, 5.3 Hz,1H), 7.42-7.24 (m, 1H), 4.67 (s, 2H), 3.80 (t, J = 5.9 Hz, 2H), 3.02 (s,2H). 407 105

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.55 (s, 1H),8.04 (s, 1H), 7.51 (ddd, J = 14.3, 10.8, 6.8 Hz, 3H), 7.13 (t, J = 53.9Hz, 1H), 4.67 (s, 2H), 3.79 (t, J = 5.7 Hz, 2H), 3.03 (t, J = 5.8 Hz,2H). 424 106

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.61 (s, 1H),8.03 (s, 1H), 7.95 (d, J = 8.4 Hz, 1H), 7.62 (d, J = 9.7 Hz, 1H), 7.41(s, 1H), 4.69 (s, 2H), 3.80 (s, 2H), 2.98 (s, 2H). 442 107

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.91 (s, 1H),8.79 (d, J = 4.9 Hz, 1H), 8.59 (s, 1H), 8.04 (s, 1H), 7.92 (d, J = 5.0Hz, 1H), 4.70 (s, 2H), 3.81 (t, J = 5.7 Hz, 2H), 3.02 (s, 2H). 425 108

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.57 (s, 1H),8.04 (s, 1H), 7.99 (dd, J = 7.8, 1.5 Hz, 1H), 7.86 (dd, J = 8.3, 1.5 Hz,1H), 7.69 (t, J = 8.0 Hz, 1H), 4.69 (s, 2H), 3.81 (t, J = 5.7 Hz, 2H),3.08-3.01 (m, 2H). 415 109

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.01 (s, 1H), 8.54 (s, 1H),8.04 (s, 1H), 7.38-7.28 (m, 1H), 7.15 (t, J = 8.9 Hz, 1H), 7.06 (d, J =8.2 Hz, 1H), 4.67 (s, 2H), 3.80 (t, J = 5.8 Hz, 2H), 3.03 (d, J = 5.8Hz, 2H), 2.48 (d, J = 7.4 Hz, 2H), 1.05 (t, J = 7.5 Hz, 3H). 402 110

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.98 (s, 1H), 8.02 (s, 1H),7.88-7.75 (m, 2H), 7.59- 7.48 (m, 2H), 4.60 (s, 2H), 3.77 (t, J = 5.7Hz, 2H), 3.74 (s, 3H), 2.89 (t, J = 5.6 Hz, 2H). 454 111

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.01 (s, 1H), 8.60 (s, 1H),8.13 (d, J = 7.4 Hz, 1H), 8.07-7.99 (m, 2H), 7.96 (d, J = 8.4 Hz, 1H),4.70 (s, 2H), 3.81 (t, J = 5.6 Hz, 2H), 3.01 (s, 2H). 449 112

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.95 (s, 1H), 7.97 (s, 1H),7.62 (dd, J = 8.5, 3.1 Hz, 1H), 7.45 (dd, J = 9.0, 5.3 Hz, 1H), 7.31(td, J = 8.5, 2.9 Hz, 1H), 6.50 (s, 2H), 4.41 (s, 2H), 3.72 (d, J = 6.0Hz, 2H), 2.80 (s, 2H). 423 113

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.95 (s, 1H), 7.97 (s, 1H),7.58 (dd, J = 7.9, 1.5 Hz, 1H), 7.47-7.38 (m, 1H), 7.41- 7.34 (m, 1H),7.34-7.25 (m, 1H), 6.48 (s, 2H), 4.41 (s, 2H), 3.73 (t, J = 5.8 Hz, 2H),2.81 (d, J = 5.7 Hz, 2H). 405 114

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.03 (s, 1H),7.66 (dd, J = 8.4, 3.0 Hz, 1H), 7.51 (dd, J = 9.0, 5.3 Hz, 1H), 7.35(td, J = 8.6, 3.0 Hz, 1H), 5.17 (t, J = 6.3 Hz, 1H), 4.67 (s, 2H), 4.32(d, J = 6.3 Hz, 2H), 3.80 (t, J = 5.7 Hz, 2H), 3.00 (d, J = 6.4 Hz, 2H).138 115

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.95 (s, 1H), 7.98 (s, 1H),7.83-7.72 (m, 2H), 7.48 (dd, J = 18.0, 8.2 Hz, 2H), 6.82 (s, 1H), 4.54(s, 1H), 4.44 (s, 2H), 3.73 (t, J = 5.6 Hz, 2H), 3.33 (m, 4H), 2.78 (s,2H). 483 116

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.96 (s, 1H), 7.97 (s, 1H),7.79-7.71 (m, 1H), 7.66 (td, J = 8.5, 3.0 Hz, 1H), 7.56 (dd, J = 9.2,4.6 Hz, 1H), 6.54 (s, 2H), 4.41 (s, 2H), 3.72 (t, J = 5.8 Hz, 2H), 2.76(t, J = 5.7 Hz, 2H). 457 117*

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.04 (s, 1H), 8.56 (s, 1H),8.02 (s, 1H), 7.67 (dd, J = 8.4, 2.5 Hz, 1H), 7.53 (dd, J = 9.2, 5.3 Hz,1H), 7.41-7.31 (m, 1H), 4.75 (d, J = 18.1 Hz, 1H), 4.62- 4.34 (m, 2H),3.23 (dd, J = 17.0, 6.0 Hz, 1H), 2.81 (d, J = 17.1 Hz, 1H), 1.20 (d, J =6.6 Hz, 3H). 422 117a*

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.04 (s, 1H), 8.56 (s, 1H),8.02 (s, 1H), 7.67 (dd, J = 8.6, 2.5 Hz, 1H), 7.58-7.50 (m, 1H), 7.36(dd, J = 9.9, 7.3 Hz, 1H), 4.76 (d, J = 18.1 Hz, 1H), 4.63- 4.40 (m,2H), 3.23 (dd, J = 17.3, 5.9 Hz, 1H), 2.81 (d, J = 17.0 Hz, 1H), 1.20(d, J = 6.7 Hz, 3H). 422 118

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.96 (s, 1H), 8.55 (s, 1H),8.02 (s, 1H), 7.66 (dd, J = 8.4, 3.0 Hz, 1H), 7.50 (dd, J = 9.0, 5.3 Hz,1H), 7.35 (td, J = 8.5, 3.0 Hz, 1H), 5.06 (q, J = 6.7 Hz, 1H), 4.00 (dd,J = 14.1, 5.7 Hz, 1H), 3.68 (ddd, J = 14.4, 11.1, 4.2 Hz, 1H), 3.06(ddd, J = 17.1, 11.2, 6.0 Hz, 1H), 2.98-2.88 (m, 1H), 1.60 (d, J = 6.8Hz, 3H). 422 119

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.98 (s, 1H), 8.03 (s, 1H),7.66 (dd, J = 8.4, 3.0 Hz, 1H), 7.51 (dd, J = 9.1, 5.3 Hz, 1H), 7.35(td, J = 8.5, 3.0 Hz, 1H), 5.06 (d, J = 5.3 Hz, 1H), 4.67 (s, 2H), 4.48(p, J = 6.4 Hz, 1H), 3.80 (t, J = 5.5 Hz, 2H), 2.99 (s, 2H), 1.22 (t, J= 6.4 Hz, 3H). 452 120

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 7.98 (s, 1H),7.90 (d, J = 5.2 Hz, 1H), 7.72 (dd, J = 8.6, 3.1 Hz, 1H), 7.63 (td, J =8.6, 3.1 Hz, 1H), 7.49 (dd, J = 9.1, 4.6 Hz, 1H), 7.00 (d, J = 5.2 Hz,1H), 4.69 (s, 2H), 3.78 (t, J = 5.8 Hz, 2H), 2.95 (t, J = 5.9 Hz, 2H).441 121

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.01 (s, 1H), 8.60 (s, 1H),8.04 (s, 1H), 7.83 (t, J = 9.2 Hz, 1H), 7.73 (d, J = 7.9 Hz, 1H),7.67-7.57 (m, 1H), 4.71 (s, 2H), 3.81 (t, J = 5.8 Hz, 2H), 3.01 (s, 2H).442 122

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.03 (s, 1H),7.88-7.75 (m, 2H), 7.57 (d, J = 8.2 Hz, 1H), 7.51 (t, J = 7.6 Hz, 1H),5.07 (d, J = 5.3 Hz, 1H), 4.67 (s, 2H), 4.50 (p, J = 6.2 Hz, 1H), 3.80(t, J = 5.6 Hz, 2H), 2.96 (s, 2H), 1.23 (d, J = 6.5 Hz, 3H). 468 123

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.03 (s, 1H),7.88-7.75 (m, 2H), 7.57 (d, J = 8.3 Hz, 1H), 7.51 (t, J = 7.7 Hz, 1H),5.07 (d, J = 5.2 Hz, 1H), 4.67 (s, 2H), 4.50 (p, J = 6.4 Hz, 1H), 3.80(t, J = 5.6 Hz, 2H), 2.96 (s, 2H), 1.23 (d, J = 6.6 Hz, 3H). 468 124

1H NMR (DMSO-d6) δ: 12.97 (br s, 1H), 8.49 (s, 1H), 8.01 (s, 1H),7.15-7.24 (m, 2H), 7.05-7.12 (m, 1H), 4.63 (s, 2H), 3.78 (t, J = 5.7 Hz,2H), 3.00 (s, 2H), 2.06 (s, 3H) 388.3 125

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.03 (s, 1H),7.81-7.74 (m, 1H), 7.74- 7.60 (m, 2H), 5.19 (t, J = 6.3 Hz, 1H), 4.67(s, 2H), 4.34 (d, J = 6.3 Hz, 2H), 3.79 (t, J = 5.6 Hz, 2H), 2.95 (s,2H). 472 126*

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.98 (s, 1H), 9.02 (s, 1H),7.97 (s, 1H), 7.63 (dd, J = 9.4, 2.6 Hz, 1H), 7.53 (p, J = 8.7 Hz, 2H),4.71 (t, J = 7.1 Hz, 1H), 4.65 (s, 2H), 3.68 (t, J = 5.7 Hz, 2H), 3.08(d, J = 16.5 Hz, 1H), 2.57 (s, 1H), 1.60 (d, J = 6.8 Hz, 3H). 454 126a*

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.97 (s, 1H), 9.02 (s, 1H),7.97 (s, 1H), 7.63 (d, J = 7.9 Hz, 1H), 7.60-7.49 (m, 2H), 4.72 (d, J =6.9 Hz, 1H), 4.65 (s, 2H), 3.68 (s, 2H), 3.08 (d, J = 16.3 Hz, 1H), 2.58(s, 1H), 1.60 (d, J = 6.8 Hz, 3H). 454 127

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.98 (s, 1H), 7.96 (s, 1H),7.81-7.74 (m, 1H), 7.55 (d, J = 8.8 Hz, 1H), 7.35-7.27 (m, 1H), 5.85 (s,1H), 4.52 (s, 2H), 3.39(s, 3H), 3.39-3.34 (m, 2H), 3.09 (s, 3H), 1.95(s, 2H). 484 128

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.01 (s, 1H), 8.03 (s, 1H),7.88-7.75 (m, 2H), 7.56 (d, J = 8.3 Hz, 1H), 7.51 (t, J = 7.7 Hz, 1H),5.19 (t, J = 6.3 Hz, 1H), 4.68 (s, 2H), 4.34 (d, J = 6.3 Hz, 2H), 3.80(t, J = 5.7 Hz, 2H), 2.96 (s, 2H). 454 129*

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.03 (s, 1H),7.78 (dd, J = 8.6, 2.9 Hz, 1H), 7.75-7.61 (m, 2H), 5.08 (d, J = 5.3 Hz,1H), 4.67 (s, 2H), 4.50 (p, J = 6.5 Hz, 1H), 3.79 (t, J = 5.7 Hz, 2H),2.94 (d, J = 6.1 Hz, 2H), 1.23 (d, J = 6.5 Hz, 3H). 486 130*

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.00 (s, 1H), 8.03 (s, 1H),7.78 (dd, J = 8.6, 3.0 Hz, 1H), 7.67 (ddd, J = 19.1, 8.6, 3.8 Hz, 2H),5.08 (d, J = 5.3 Hz, 1H), 4.67 (s, 2H), 4.50 (p, J = 6.5 Hz, 1H), 3.79(t, J = 5.5 Hz, 2H), 2.95 (s, 2H), 1.23 (d, J = 6.6 Hz, 3H). 486 131

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.07 (s, 1H), 8.89- 8.79 (m,2H), 8.59 (s, 1H), 7.94- 7.84 (m, 2H), 4.53 (s, 2H), 3.44 (d, J = 11.0Hz, 2H), 3.41 (s, 3H), 1.96 (t, J = 5.6 Hz, 2H). 438 132

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.94 (s, 1H), 8.89 (s, 1H),8.00 (d, J = 8.8 Hz, 1H), 7.87 (s, 1H), 7.62 (d, J = 8.6 Hz, 2H), 4.58(s, 2H), 3.48 (s, 2H), 2.27 (s, 2H), 1.84 (s, 2H), 1.47 (s, 2H). 466 133

1H NMR (400 MHz, Methanol-d4) chemical shifts 8.34 (s, 1H), 8.02 (s,1H), 7.33 (q, J = 7.8 Hz, 4H), 7.25 (t, J = 7.0 Hz, 1H), 4.67 (d, J =17.3 Hz, 1H), 4.58 (d, J = 17.2 Hz, 2H), 3.97 (d, J = 13.9 Hz, 1H), 3.55(s, 2H), 3.47 (s, 1H), 3.39 (s, 3H), 2.94 (s, 1H), 2.81 (d, J = 15.8 Hz,1H), 2.74-2.53 (m, 3H), 2.35 (s, 1H), 2.15 (s, 1H), 1.76 (s, 2H), 1.01(d, J = 7.0 Hz, 3H). 480 133a

1H NMR (400 MHz, Methanol-d4) chemical shifts 8.34 (s, 1H), 8.02 (s,1H), 7.42-7.21 (m, 5H), 4.62 (q, J = 17.5 Hz, 3H), 3.97 (d, J = 13.3 Hz,1H), 3.55 (s, 2H), 3.47 (s, 1H), 3.39 (s, 3H), 3.15 (s, 1H), 2.94 (s,1H), 2.87-2.61 (m, 3H), 2.35 (s, 1H), 2.15 (s, 1H), 1.76 (s, 2H), 1.01(d, J = 7.0 Hz, 3H). 480 134

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.01 (s, 1H), 8.03 (s, 1H),7.58-7.49 (m, 3H), 7.27- 7.00 (m, 1H), 5.17 (t, J = 6.3 Hz, 1H), 4.66(s, 2H), 4.34 (d, J = 6.3 Hz, 2H), 3.79 (t, J = 5.7 Hz, 2H), 2.99 (s,2H). 454 135*

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.97 (s, 1H), 8.03 (s, 1H),7.78 (dd, J = 8.5, 3.0 Hz, 1H), 7.75-7.61 (m, 2H), 5.12 (d, J = 5.7 Hz,1H), 4.67 (s, 2H), 4.57 (t, J = 6.0 Hz, 1H), 4.37 (q, J = 5.8 Hz, 1H),3.79 (t, J = 5.7 Hz, 2H), 3.57 (dt, J = 11.2, 5.7 Hz, 1H), 3.46 (dt, J =10.8, 6.1 Hz, 1H), 2.96 (t, J = 5.6 Hz, 2H). 502 136

1H NMR (400 MHz, Methanol-d4) chemical shifts 8.54 (s, 1H), 7.87 (s,1H), 7.75 (s, 1H), 7.63 (dd, J = 8.8, 3.0 Hz, 1H), 7.54 (s, 1H), 4.57(m, 3H), 3.88 (s, 2H), 3.51 (m, 3H), 2.05 (s, 1H), 1.98 (s, 1H). 485137*

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.94 (s, 1H), 8.03 (s, 1H),7.78 (dd, J = 8.5, 3.0 Hz, 1H), 7.75-7.61 (m, 2H), 5.12 (d, J = 5.7 Hz,1H), 4.67 (s, 2H), 4.57 (t, J = 6.0 Hz, 1H), 4.37 (q, J = 5.7 Hz, 1H),3.79 (t, J = 5.7 Hz, 2H), 3.57 (dt, J = 11.2, 5.7 Hz, 1H), 3.52- 3.43(m, 1H), 2.96 (t, J = 5.6 Hz, 2H). 502 138

1H NMR (400 MHz, DMSO-d6) chemical shifts 13.05 (s, 1H), 8.11 (s, 1H),7.78 (dd, J = 8.5, 3.1 Hz, 1H), 7.70 (td, J = 8.5, 3.2 Hz, 1H), 7.57(dd, J = 9.1, 4.6 Hz, 1H), 4.65 (s, 2H), 3.66 (t, J = 5.7 Hz, 2H), 3.38(s, 3H), 2.74 (t, J = 5.4 Hz, 2H). 472 139

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.84 (s, 1H), 8.02 (s, 1H),7.79 (dd, J = 8.6, 2.9 Hz, 1H), 7.68 (dtd, J = 18.8, 9.0, 3.8 Hz, 2H),4.60 (s, 2H), 3.77 (d, J = 5.6 Hz, 2H), 3.75 (s, 3H), 2.88 (t, J = 5.7Hz, 2H) 472 140

1H NMR (400 MHz, DMSO-d6) chemical shifts 12.97 (s, 1H), 8.30 (d, J =5.6 Hz, 1H), 8.02 (s, 1H), 7.83 (dd, J = 8.5, 3.2 Hz, 1H), 7.68 (td, J =8.6, 3.1 Hz, 1H), 7.50 (dd J = 9.1, 4.5 Hz, 1H), 6.58 (d, J = 5.6 Hz,1H), 4.69 (s, 2H), 3.77 (t, J = 5.7 Hz, 2H), 2.98 (t, J = 5.8 Hz, 2H).441 *Compound is a pure isomer separated from its opposite isomer byHPLC of the corresponding racemic mixture. Absolute orientation has notbeen determined and therefore designation of the specific orientationaround a chiral center is arbitrary.

Example 26. Effect of Compound 100 on Puromycin Aminonucleoside(PAN)-Induced Glomerular Injury in Rats Objective:

The objective of this study is to evaluate the dose-dependent effects ofcompound 100 on PAN induced glomerular kidney injury as indexed byalbuminuria.

Methods:

Eighty (80), male Sprague-Dawley rats weighing approximately 125-150 gand approximately 5-6 weeks of age were acquired from Charles River.They were fed a standard chow diet (Harlan 8640), housed under standardconditions, and allowed to acclimate for at least 5 days prior to studyinception.

On D-2, rats were placed into weight-matched treatment groups and wereplaced, individually housed, into metabolic cages for the balance of thestudy.

A 24 hour baseline (Day 0) urine was collected followed by a baselineblood collection via conscious tail venous puncture. Rats were thenadministered vehicle or test article.

Two (2) hours following administration of vehicle or test agent on Day0, rats received an administration of (5 ml/kg, s.c.) vehicle (sterilesaline) or puromycin aminonucleoside (PAN; challenge agent; 75 mg/kg)dissolved in vehicle.

Intermittent (Day 4, 7 and 10) 24 hour urine volumes were determined andsamples (4 samples/animal/time point; 0.5 ml/sample) were obtained.Additionally, intermittent (Day 4, 7 and 10) blood samples werecollected via conscious tail venous puncture 2 hours±1 minute post-AMdose.

Immediately following the last blood collection, rats were anesthetizedwith isoflurane, tissues harvested, and animals sacrificed. Endpointkidney weights and indices were obtained.

Urine samples were immediately flash-frozen in liquid N₂ and stored at−80° C. until analyzed.

Whole blood samples collected on K₃EDTA were processed appropriately forthe production of plasma for PK measurements.

Results:

As shown in FIG. 1, treatment with compound 100 at 30 mg/kg once- (QD)or twice-(BID) daily resulted in reduced urinary albumin excretion onfollowing injury with PAN. Significant reductions were seen at 7 and 10days with BID dosing, and at 10 days with QD dosing of compound 100.Mizoribine, the positive control compound, was also efficacious inreducing albuminuria.

Conclusion:

Compound 100 is effective in reducing albuminuria in the PAN model ofglomerular injury in rats.

Example 27. Compound 100 is Efficacious in the AT1R Transgenic Rat Modelof FSGS

The AT1R transgenic rat model of FSGS is characterized bypodocyte-specific expression of human AT1R. Males have been shown tohave substantially worse pathology compared to females. The efficacy ofTRPC5 inhibitors in the AT1R model has been demonstrated with a toolcompound. See Zhou et al., Science (2017), vol. 358 (6368), 1332-1336.

In the present study, pathophysiology in AT1R transgenic rats wasaccelerated with unilateral nephrectomy (UniNX) and minipump AngIIinfusion. Compound 100 was dosed orally once daily at 3 mg/kg or 10mg/kg, and the urine protein creatinine ratio was determined at −1, 0,1, 2, and 3 weeks of treatment. FIG. 2 shows the urine proteincreatinine ratio over the course of the study for rats treated withcompound 100 or those treated with vehicle. UniNX, AngII incept, andcompound 100 incept occurred at the time points indicated. FIG. 3 showsthe same data presented as % of baseline.

The results show that compound 100 is efficacious in the AT1R transgenicrat model of FSGS.

INCORPORATION BY REFERENCE

All of the U.S. patents and U.S. and PCT published patent applicationscited herein are hereby incorporated by reference.

EQUIVALENTS

The foregoing written specification is sufficient to enable one skilledin the art to practice the invention. The present invention is not to belimited in scope by examples provided, since the examples are intendedas a single illustration of one aspect of the invention and otherfunctionally equivalent embodiments are within the scope of theinvention. Various modifications of the invention in addition to thoseshown and described herein will become apparent to those skilled in theart from the foregoing description and fall within the scope of theappended claims. The advantages and objects of the invention are notnecessarily encompassed by each embodiment of the invention.

SEQ ID NO:1 TRPC4 Plasmid Sequence

GACGGATCGGGAGATCTCCCGATCCCCTATGGTGCACTCTCAGTACAATCTGCTCTGATGCCGCATAGTTAAGCCAGTATCTGCTCCCTGCTTGTGTGTTGGAGGTCGCTGAGTAGTGCGCGAGCAAAATTTAAGCTACAACAAGGCAAGGCTTGACCGACAATTGCATGAAGAATCTGCTTAGGGTTAGGCGTTTTGCGCTGCTTCGCGATGTACGGGCCAGATATACGCGTTGACATTGATTATTGACTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTCTCCCTATCAGTGATAGAGATCTCCCTATCAGTGATAGAGATCGTCGACGAGCTCGTTTAGTGAACCGTCAGATCGCCTGGAGACGCCATCCACGCTGTTTTGACCTCCATAGAAGACACCGGGACCGATCCAGCCTCCGGACTCTAGCGTTTAAACTTAAGCTTGGTACCGAGCTCGGATCCGCCACCATGGCCCAGTTCTACTATAAGAGAAACGTGAATGCCCCTTACCGCGACAGAATCCCCCTGAGAATCGTGAGGGCAGAGTCCGAGCTGAGCCCATCCGAGAAGGCCTACCTGAACGCCGTGGAGAAGGGCGACTATGCCAGCGTGAAGAAGTCCCTGGAGGAGGCCGAGATCTACTTTAAGATCAACATCAATTGCATCGATCCTCTGGGCAGAACCGCCCTGCTGATCGCCATCGAGAACGAGAATCTGGAGCTGATCGAGCTGCTGCTGAGCTTCAACGTGTATGTGGGCGATGCCCTGCTGCACGCCATCAGGAAGGAGGTGGTGGGAGCAGTGGAGCTGCTGCTGAATCACAAGAAGCCAAGCGGAGAGAAGCAGGTGCCACCTATCCTGCTGGACAAGCAGTTCTCCGAGTTTACCCCAGATATCACACCCATCATCCTGGCCGCCCACACCAACAATTACGAGATCATCAAGCTGCTGGTGCAGAAGGGCGTGTCCGTGCCTCGCCCACACGAGGTGCGGTGCAACTGCGTGGAGTGCGTGAGCTCCTCTGACGTGGATTCTCTGAGGCACAGCCGGAGCCGGCTGAACATCTATAAGGCCCTGGCCTCCCCATCTCTGATCGCCCTGAGCTCCGAGGACCCCTTCCTGACCGCCTTTCAGCTGTCTTGGGAGCTGCAGGAGCTGAGCAAGGTGGAGAACGAGTTTAAGAGCGAGTACGAGGAGCTGTCCAGACAGTGCAAGCAGTTCGCCAAGGACCTGCTGGATCAGACACGCTCTAGCCGGGAGCTGGAGATCATCCTGAACTATAGGGACGATAATTCTCTGATCGAGGAGCAGAGCGGAAACGACCTGGCACGCCTGAAGCTGGCCATCAAGTACCGGCAGAAGGAGTTCGTGGCCCAGCCTAATTGTCAGCAGCTGCTGGCCTCCCGCTGGTATGATGAGTTTCCAGGATGGCGGAGAAGGCACTGGGCAGTGAAGATGGTGACCTGCTTCATCATCGGCCTGCTGTTCCCCGTGTTCAGCGTGTGCTACCTGATCGCCCCTAAGTCTCCACTGGGCCTGTTTATCCGGAAGCCTTTCATCAAGTTTATCTGCCACACCGCCAGCTATCTGACATTCCTGTTTCTGCTGCTGCTGGCCTCCCAGCACATCGACAGATCTGATCTGAACAGGCAGGGCCCACCCCCTACCATCGTGGAGTGGATGATCCTGCCATGGGTGCTGGGCTTCATCTGGGGCGAGATCAAGCAGATGTGGGACGGCGGCCTGCAGGACTACATCCACGATTGGTGGAACCTGATGGATTTTGTGATGAATTCCCTGTACCTGGCCACAATCTCTCTGAAGATCGTGGCCTTCGTGAAGTATAGCGCCCTGAATCCCAGAGAGTCCTGGGACATGTGGCACCCTACCCTGGTGGCAGAGGCCCTGTTCGCAATCGCCAACATCTTTTCCTCTCTGCGCCTGATCAGCCTGTTTACAGCCAATTCCCACCTGGGACCACTGCAGATCTCCCTGGGACGGATGCTGCTGGATATCCTGAAGTTCCTGTTTATCTACTGCCTGGTGCTGCTGGCCTTCGCCAACGGCCTGAATCAGCTGTACTTCTACTATGAGGAGACCAAGGGCCTGACATGCAAGGGCATCCGCTGTGAGAAGCAGAACAATGCCTTCAGCACCCTGTTCGAGACACTGCAGTCTCTGTTCTGGAGCATCTTTGGCCTGATCAACCTGTACGTGACCAATGTGAAGGCCCAGCACGAGTTCACAGAGTTTGTGGGCGCCACCATGTTCGGCACATACAACGTGATCTCTCTGGTGGTGCTGCTGAATATGCTGATCGCCATGATGAACAATAGCTATCAGCTGATCGCCGACCACGCCGATATCGAGTGGAAGTTCGCCCGGACCAAGCTGTGGATGTCCTACTTTGAGGAGGGCGGCACCCTGCCCACACCTTTCAACGTGATCCCATCCCCCAAGTCTCTGTGGTATCTGATCAAGTGGATCTGGACACACCTGTGCAAGAAGAAGATGCGCCGGAAGCCTGAGAGCTTTGGCACCATCGGCGTGCGCACACAGCACAGAAGGGCAGCAGACAACCTGCGCCGGCACCACCAGTACCAGGAAGTGATGCGCAATCTGGTGAAGCGGTATGTGGCCGCCATGATCAGGGACGCAAAGACCGAGGAGGGACTGACAGAGGAGAACTTCAAGGAGCTGAAGCAGGATATCAGCTCCTTCAGATTTGAGGTGCTGGGCCTGCTGAGGGGCAGCAAGCTGTCCACCATCCAGTCCGCCAACGCCTCTAAGGAGTCTAGCAATTCTGCCGACAGCGATGAGAAGAGCGACTCCGAGGGCAACTCTAAGGATAAGAAGAAGAACTTCAGCCTGTTTGACCTGACCACACTGATCCACCCACGCAGCGCCGCAATCGCATCCGAGCGGCACAACATCTCCAATGGCTCTGCCCTGGTGGTGCAGGAGCCACCAAGAGAGAAGCAGAGGAAGGTGAACTTTGTGACAGATATCAAGAATTTCGGCCTGTTTCACAGAAGGAGCAAGCAGAACGCCGCCGAGCAGAACGCCAATCAGATCTTCTCTGTGAGCGAGGAGGTGGCAAGACAGCAGGCAGCAGGACCACTGGAGAGGAATATCCAGCTGGAGAGCCGGGGACTGGCAAGCAGGGGCGACCTGTCCATCCCAGGACTGTCTGAGCAGTGCGTGCTGGTGGACCACAGGGAGCGGAACACCGATACACTGGGACTGCAAGTGGGCAAGCGGGTGTGCCCTTTCAAGAGCGAGAAGGTCGTGGTGGAGGACACCGTGCCCATCATCCCTAAGGAGAAGCACGCCAAGGAGGAGGATTCCTCTATCGACTACGATCTGAATCTGCCAGACACCGTGACACACGAGGATTATGTGACCACAAGGCTGTGAGCGGCCGCTCTAGAGGGCCCGTTTAAACCCGCTGATCAGCCTCGACTGTGCCTTCTAGTTGCCAGCCATCTGTTGTTTGCCCCTCCCCCGTGCCTTCCTTGACCCTGGAAGGTGCCACTCCCACTGTCCTTTCCTAATAAAATGAGGAAATTGCATCGCATTGTCTGAGTAGGTGTCATTCTATTCTGGGGGGTGGGGTGGGGCAGGACAGCAAGGGGGAGGATTGGGAAGACAATAGCAGGCATGCTGGGGATGCGGTGGGCTCTATGGCTTCTGAGGCGGAAAGAACCAGCTGGGGCTCTAGGGGGTATCCCCACGCGCCCTGTAGCGGCGCATTAAGCGCGGCGGGTGTGGTGGTTACGCGCAGCGTGACCGCTACACTTGCCAGCGCCCTAGCGCCCGCTCCTTTCGCTTTCTTCCCTTCCTTTCTCGCCACGTTCGCCGGCTTTCCCCGTCAAGCTCTAAATCGGGGGCTCCCTTTAGGGTTCCGATTTAGTGCTTTACGGCACCTCGACCCCAAAAAACTTGATTAGGGTGATGGTTCACGTAGTGGGCCATCGCCCTGATAGACGGTTTTTCGCCCTTTGACGTTGGAGTCCACGTTCTTTAATAGTGGACTCTTGTTCCAAACTGGAACAACACTCAACCCTATCTCGGTCTATTCTTTTGATTTATAAGGGATTTTGCCGATTTCGGCCTATTGGTTAAAAAATGAGCTGATTTAACAAAAATTTAACGCGAATTAATTCTGTGGAATGTGTGTCAGTTAGGGTGTGGAAAGTCCCCAGGCTCCCCAGCAGGCAGAAGTATGCAAAGCATGCATCTCAATTAGTCAGCAACCAGGTGTGGAAAGTCCCCAGGCTCCCCAGCAGGCAGAAGTATGCAAAGCATGCATCTCAATTAGTCAGCAACCATAGTCCCGCCCCTAACTCCGCCCATCCCGCCCCTAACTCCGCCCAGTTCCGCCCATTCTCCGCCCCATGGCTGACTAATTTTTTTTATTTATGCAGAGGCCGAGGCCGCCTCTGCCTCTGAGCTATTCCAGAAGTAGTGAGGAGGCTTTTTTGGAGGCCTAGGCTTTTGCAAAAAGCTCCCGGGAGCTTGTATATCCATTTTCGGATCTGATCAGCACGTGATGAAAAAGCCTGAACTCACCGCGACGTCTGTCGAGAAGTTTCTGATCGAAAAGTTCGACAGCGTCTCCGACCTGATGCAGCTCTCGGAGGGCGAAGAATCTCGTGCTTTCAGCTTCGATGTAGGAGGGCGTGGATATGTCCTGCGGGTAAATAGCTGCGCCGATGGTTTCTACAAAGATCGTTATGTTTATCGGCACTTTGCATCGGCCGCGCTCCCGATTCCGGAAGTGCTTGACATTGGGGAATTCAGCGAGAGCCTGACCTATTGCATCTCCCGCCGTGCACAGGGTGTCACGTTGCAAGACCTGCCTGAAACCGAACTGCCCGCTGTTCTGCAGCCGGTCGCGGAGGCCATGGATGCGATCGCTGCGGCCGATCTTAGCCAGACGAGCGGGTTCGGCCCATTCGGACCGCAAGGAATCGGTCAATACACTACATGGCGTGATTTCATATGCGCGATTGCTGATCCCCATGTGTATCACTGGCAAACTGTGATGGACGACACCGTCAGTGCGTCCGTCGCGCAGGCTCTCGATGAGCTGATGCTTTGGGCCGAGGACTGCCCCGAAGTCCGGCACCTCGTGCACGCGGATTTCGGCTCCAACAATGTCCTGACGGACAATGGCCGCATAACAGCGGTCATTGACTGGAGCGAGGCGATGTTCGGGGATTCCCAATACGAGGTCGCCAACATCTTCTTCTGGAGGCCGTGGTTGGCTTGTATGGAGCAGCAGACGCGCTACTTCGAGCGGAGGCATCCGGAGCTTGCAGGATCGCCGCGGCTCCGGGCGTATATGCTCCGCATTGGTCTTGACCAACTCTATCAGAGCTTGGTTGACGGCAATTTCGATGATGCAGCTTGGGCGCAGGGTCGATGCGACGCAATCGTCCGATCCGGAGCCGGGACTGTCGGGCGTACACAAATCGCCCGCAGAAGCGCGGCCGTCTGGACCGATGGCTGTGTAGAAGTACTCGCCGATAGTGGAAACCGACGCCCCAGCACTCGTCCGAGGGCAAAGGAATAGCACGTGCTACGAGATTTCGATTCCACCGCCGCCTTCTATGAAAGGTTGGGCTTCGGAATCGTTTTCCGGGACGCCGGCTGGATGATCCTCCAGCGCGGGGATCTCATGCTGGAGTTCTTCGCCCACCCCAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTATCATGTCTGTATACCGTCGACCTCTAGCTAGAGCTTGGCGTAATCATGGTCATAGCTGTTTCCTGTGTGAAATTGTTATCCGCTCACAATTCCACACAACATACGAGCCGGAAGCATAAAGTGTAAAGCCTGGGGTGCCTAATGAGTGAGCTAACTCACATTAATTGCGTTGCGCTCACTGCCCGCTTTCCAGTCGGGAAACCTGTCGTGCCAGCTGCATTAATGAATCGGCCAACGCGCGGGGAGAGGCGGTTTGCGTATTGGGCGCTCTTCCGCTTCCTCGCTCACTGACTCGCTGCGCTCGGTCGTTCGGCTGCGGCGAGCGGTATCAGCTCACTCAAAGGCGGTAATACGGTTATCCACAGAATCAGGGGATAACGCAGGAAAGAACATGTGAGCAAAAGGCCAGCAAAAGGCCAGGAACCGTAAAAAGGCCGCGTTGCTGGCGTTTTTCCATAGGCTCCGCCCCCCTGACGAGCATCACAAAAATCGACGCTCAAGTCAGAGGTGGCGAAACCCGACAGGACTATAAAGATACCAGGCGTTTCCCCCTGGAAGCTCCCTCGTGCGCTCTCCTGTTCCGACCCTGCCGCTTACCGGATACCTGTCCGCCTTTCTCCCTTCGGGAAGCGTGGCGCTTTCTCATAGCTCACGCTGTAGGTATCTCAGTTCGGTGTAGGTCGTTCGCTCCAAGCTGGGCTGTGTGCACGAACCCCCCGTTCAGCCCGACCGCTGCGCCTTATCCGGTAACTATCGTCTTGAGTCCAACCCGGTAAGACACGACTTATCGCCACTGGCAGCAGCCACTGGTAACAGGATTAGCAGAGCGAGGTATGTAGGCGGTGCTACAGAGTTCTTGAAGTGGTGGCCTAACTACGGCTACACTAGAAGAACAGTATTTGGTATCTGCGCTCTGCTGAAGCCAGTTACCTTCGGAAAAAGAGTTGGTAGCTCTTGATCCGGCAAACAAACCACCGCTGGTAGCGGTTGGTTTTTTGTTTGCAAGCAGCAGATTACGCGCAGAAAAAAAGGATCTCAAGAAGATCCTTTGATCTTTTCTACGGGGTCTGACGCTCAGTGGAACGAAAACTCACGTTAAGGGATTTTGGTCATGAGATTATCAAAAAGGATCTTCACCTAGATCCTTTTAAATTAAAAATGAAGTTTTAAATCAATCTAAAGTATATATGAGTAAACTTGGTCTGACAGTTACCAATGCTTAATCAGTGAGGCACCTATCTCAGCGATCTGTCTATTTCGTTCATCCATAGTTGCCTGACTCCCCGTCGTGTAGATAACTACGATACGGGAGGGCTTACCATCTGGCCCCAGTGCTGCAATGATACCGCGAGACCCACGCTCACCGGCTCCAGATTTATCAGCAATAAACCAGCCAGCCGGAAGGGCCGAGCGCAGAAGTGGTCCTGCAACTTTATCCGCCTCCATCCAGTCTATTAATTGTTGCCGGGAAGCTAGAGTAAGTAGTTCGCCAGTTAATAGTTTGCGCAACGTTGTTGCCATTGCTACAGGCATCGTGGTGTCACGCTCGTCGTTTGGTATGGCTTCATTCAGCTCCGGTTCCCAACGATCAAGGCGAGTTACATGATCCCCCATGTTGTGCAAAAAAGCGGTTAGCTCCTTCGGTCCTCCGATCGTTGTCAGAAGTAAGTTGGCCGCAGTGTTATCACTCATGGTTATGGCAGCACTGCATAATTCTCTTACTGTCATGCCATCCGTAAGATGCTTTTCTGTGACTGGTGAGTACTCAACCAAGTCATTCTGAGAATAGTGTATGCGGCGACCGAGTTGCTCTTGCCCGGCGTCAATACGGGATAATACCGCGCCACATAGCAGAACTTTAAAAGTGCTCATCATTGGAAAACGTTCTTCGGGGCGAAAACTCTCAAGGATCTTACCGCTGTTGAGATCCAGTTCGATGTAACCCACTCGTGCACCCAACTGATCTTCAGCATCTTTTACTTTCACCAGCGTTTCTGGGTGAGCAAAAACAGGAAGGCAAAATGCCGCAAAAAAGGGAATAAGGGCGACACGGAAATGTTGAATACTCATACTCTTCCTTTTTCAATATTATTGAAGCATTTATCAGGGTTATTGTCTCATGAGCGGATACATATTTGAATGTATTTAGAAAAATAAACAAATAGGGGTTCCGCGCACATTTCCCCGAAAAGTGCCACCTGACGTC

SEQ ID NO:2 TRPC5 Plasmid Sequence

The DNA sequence of the TRPC5 plasmid used in Example 25 is includedbelow. Underlined nucleic acids represent those encoding human TRPC5.

GACGGATCGGGAGATCTCCCGATCCCCTATGGTGCACTCTCAGTACAATCTGCTCTGATGCCGCATAGTTAAGCCAGTATCTGCTCCCTGCTTGTGTGTTGGAGGTCGCTGAGTAGTGCGCGAGCAAAATTTAAGCTACAACAAGGCAAGGCTTGACCGACAATTGCATGAAGAATCTGCTTAGGGTTAGGCGTTTTGCGCTGCTTCGCGATGTACGGGCCAGATATACGCGTTGACATTGATTATTGACTAGTTATTAATAGTAATCAATTACGGGGTCATTAGTTCATAGCCCATATATGGAGTTCCGCGTTACATAACTTACGGTAAATGGCCCGCCTGGCTGACCGCCCAACGACCCCCGCCCATTGACGTCAATAATGACGTATGTTCCCATAGTAACGCCAATAGGGACTTTCCATTGACGTCAATGGGTGGAGTATTTACGGTAAACTGCCCACTTGGCAGTACATCAAGTGTATCATATGCCAAGTACGCCCCCTATTGACGTCAATGACGGTAAATGGCCCGCCTGGCATTATGCCCAGTACATGACCTTATGGGACTTTCCTACTTGGCAGTACATCTACGTATTAGTCATCGCTATTACCATGGTGATGCGGTTTTGGCAGTACATCAATGGGCGTGGATAGCGGTTTGACTCACGGGGATTTCCAAGTCTCCACCCCATTGACGTCAATGGGAGTTTGTTTTGGCACCAAAATCAACGGGACTTTCCAAAATGTCGTAACAACTCCGCCCCATTGACGCAAATGGGCGGTAGGCGTGTACGGTGGGAGGTCTATATAAGCAGAGCTCTCCCTATCAGTGATAGAGATCTCCCTATCAGTGATAGAGATCGTCGACGAGCTCGTTTAGTGAACCGTCAGATCGCCTGGAGACGCCATCCACGCTGTTTTGACCTCCATAGAAGACACCGGGACCGATCCAGCCTCCGGACTCTAGCGTTTAAACTTAAGCCCAAGCTGGCTAGACCGCCATGGCCCAACTGTACTACAAAAAGGTCAACTACTCACCGTACAGAGACCGCATCCCCCTGCAAATTGTGAGGGCTGAGACAGAGCTCTCTGCAGAGGAGAAGGCCTTCCTCAATGCTGTGGAGAAGGGGGACTATGCCACTGTGAAGCAGGCCCTTCAGGAGGCTGAGATCTACTATAATGTTAACATCAACTGCATGGACCCCTTGGGCCGGAGTGCCCTGCTCATTGCCATTGAGAACGAGAACCTGGAGATCATGGAGCTACTGCTGAACCACAGCGTGTATGTGGGTGATGCATTGCTCTATGCCATACGCAAGGAAGTGGTGGGCGCTGTGGAGCTTCTGCTCAGCTACAGGCGGCCCAGCGGAGAGAAGCAGGTCCCCACTCTGATGATGGACACGCAGTTCTCTGAATTCACACCGGACATCACTCCCATCATGCTGGCTGCCCACACCAACAACTACGAAATCATCAAACTGCTTGTCCAAAAACGGGTCACTATCCCACGGCCCCACCAGATCCGCTGCAACTGTGTGGAGTGTGTGTCTAGTTCAGAGGTAGACAGCCTGCGCCACTCTCGCTCCCGACTGAACATCTATAAGGCTCTGGCAAGCCCCTCACTCATTGCCTTATCAAGTGAGGACCCCATCCTAACTGCCTTCCGTCTGGGCTGGGAGCTCAAGGAGCTCAGCAAGGTGGAGAATGAGTTCAAGGCCGAGTATGAGGAGCTCTCTCAGCAGTGCAAGCTCTTTGCCAAAGACCTGCTGGACCAAGCTCGGAGCTCCAGGGAACTGGAGATCATCCTCAACCATCGAGATGACCACAGTGAAGAGCTTGACCCTCAGAAGTACCATGACCTGGCCAAGTTGAAGGTGGCAATCAAATACCACCAGAAAGAGTTTGTTGCTCAGCCCAACTGCCAACAGTTGCTTGCCACCCTGTGGTATGATGGCTTCCCTGGATGGCGGCGGAAACACTGGGTAGTCAAGCTTCTAACCTGCATGACCATTGGGTTCCTGTTTCCCATGCTGTCTATAGCCTACCTGATCTCACCCAGGAGCAACCTTGGGCTGTTCATCAAGAAACCCTTTATCAAGTTTATCTGCCACACAGCATCCTATTTGACCTTCCTCTTTATGCTTCTCCTGGCTTCTCAGCACATTGTCAGGACAGACCTTCATGTACAGGGGCCTCCCCCAACTGTCGTGGAATGGATGATATTGCCTTGGGTTCTAGGTTTCATTTGGGGTGAGATTAAGGAAATGTGGGATGGTGGATTTACTGAATACATCCATGACTGGTGGAACCTGATGGATTTTGCAATGAACTCCCTCTACCTGGCAACTATTTCCCTGAAGATTGTGGCCTATGTCAAGTATAATGGTTCTCGTCCAAGGGAGGAATGGGAAATGTGGCACCCGACTCTGATTGCGGAAGCACTCTTCGCAATATCCAACATTTTAAGTTCGTTGCGTCTCATATCCCTGTTCACAGCCAACTCCCACTTAGGACCTCTGCAGATCTCTTTGGGACGCATGCTGCTTGATATCCTCAAATTCCTCTTTATCTACTGCCTGGTACTACTAGCTTTTGCCAATGGACTGAACCAGCTTTACTTCTATTATGAAACCAGAGCTATCGATGAGCCTAACAACTGCAAGGGGATCCGATGTGAGAAACAGAACAATGCCTTCTCCACGCTCTTTGAGACTCTTCAGTCACTCTTCTGGTCTGTATTTGGCCTTTTAAATCTATATGTCACCAATGTGAAAGCCAGACACGAATTCACCGAGTTTGTAGGAGCTACCATGTTTGGAACATACAATGTCATCTCCCTGGTAGTGCTGCTGAACATGCTGATTGCTATGATGAACAACTCCTATCAGCTTATTGCCGATCATGCTGATATCGAGTGGAAGTTTGCAAGGACGAAGCTCTGGATGAGTTACTTTGATGAAGGTGGCACCTTGCCACCTCCTTTCAACATCATCCCCAGCCCCAAGTCATTTCTATACCTTGGTAACTGGTTCAACAACACCTTCTGCCCCAAAAGAGACCCTGACGGTAGACGGAGAAGGCGCAACTTGAGAAGTTTCACAGAACGCAATGCTGACAGCCTGATACAAAATCAACATTATCAGGAAGTTATCAGGAATTTAGTCAAAAGATATGTGGCTGCTATGATAAGAAATTCCAAAACACATGAGGGACTTACAGAAGAAAATTTTAAGGAATTAAAGCAAGACATCTCCAGCTTTCGGTATGAAGTGCTTGACCTCTTGGGAAATAGAAAACATCCAAGGAGCTTTTCCACTAGCAGCACTGAACTGTCTCAGAGAGACGATAATAATGATGGCAGTGGTGGGGCTCGGGCCAAATCCAAGAGTGTCTCTTTTAATTTAGGCTGCAAGAAAAAGACTTGCCATGGGCCACCTCTCATCAGAACCATGCCAAGGTCCAGTGGTGCCCAAGGAAAGTCAAAAGCTGAGTCATCAAGCAAACGCTCCTTCATGGGTCCTTCTCTCAAGAAACTGGGTCTCCTATTCTCCAAATTTAATGGTCATATGTCTGAACCCAGTTCAGAGCCAATGTACACAATTTCTGATGGAATTGTTCAGCAGCACTGTATGTGGCAGGACATCAGATATTCTCAGATGGAGAAAGGGAAAGCAGAGGCCTGTTCTCAAAGTGAAATTAACCTCAGTGAGGTAGAATTAGGTGAAGTCCAGGGCGCTGCTCAGAGCAGTGAATGCCCTCTAGCCTGTTCCAGCTCTCTTCACTGTGCATCCAGCATCTGCTCCTCAAATTCTAAACTTTTAGACTCCTCAGAGGATGTATTTGAAACTTGGGGAGAGGCTTGTGACTTGCTCATGCACAAATGGGGTGATGGACAGGAAGAACAAGTTACAACTCGCCTCTAATGACTCGAGTCTAGAGGGCCCGTTTAAACCCGCTGATCAGCCTCGACTGTGCCTTCTAGTTGCCAGCCATCTGTTGTTTGCCCCTCCCCCGTGCCTTCCTTGACCCTGGAAGGTGCCACTCCCACTGTCCTTTCCTAATAAAATGAGGAAATTGCATCGCATTGTCTGAGTAGGTGTCATTCTATTCTGGGGGGTGGGGTGGGGCAGGACAGCAAGGGGGAGGATTGGGAAGACAATAGCAGGCATGCTGGGGATGCGGTGGGCTCTATGGCTTCTGAGGCGGAAAGAACCAGCTGGGGCTCTAGGGGGTATCCCCACGCGCCCTGTAGCGGCGCATTAAGCGCGGCGGGTGTGGTGGTTACGCGCAGCGTGACCGCTACACTTGCCAGCGCCCTAGCGCCCGCTCCTTTCGCTTTCTTCCCTTCCTTTCTCGCCACGTTCGCCGGCTTTCCCCGTCAAGCTCTAAATCGGGGGCTCCCTTTAGGGTTCCGATTTAGTGCTTTACGGCACCTCGACCCCAAAAAACTTGATTAGGGTGATGGTTCACGTAGTGGGCCATCGCCCTGATAGACGGTTTTTCGCCCTTTGACGTTGGAGTCCACGTTCTTTAATAGTGGACTCTTGTTCCAAACTGGAACAACACTCAACCCTATCTCGGTCTATTCTTTTGATTTATAAGGGATTTTGCCGATTTCGGCCTATTGGTTAAAAAATGAGCTGATTTAACAAAAATTTAACGCGAATTAATTCTGTGGAATGTGTGTCAGTTAGGGTGTGGAAAGTCCCCAGGCTCCCCAGCAGGCAGAAGTATGCAAAGCATGCATCTCAATTAGTCAGCAACCAGGTGTGGAAAGTCCCCAGGCTCCCCAGCAGGCAGAAGTATGCAAAGCATGCATCTCAATTAGTCAGCAACCATAGTCCCGCCCCTAACTCCGCCCATCCCGCCCCTAACTCCGCCCAGTTCCGCCCATTCTCCGCCCCATGGCTGACTAATTTTTTTTATTTATGCAGAGGCCGAGGCCGCCTCTGCCTCTGAGCTATTCCAGAAGTAGTGAGGAGGCTTTTTTGGAGGCCTAGGCTTTTGCAAAAAGCTCCCGGGAGCTTGTATATCCATTTTCGGATCTGATCAGCACGTGATGAAAAAGCCTGAACTCACCGCGACGTCTGTCGAGAAGTTTCTGATCGAAAAGTTCGACAGCGTCTCCGACCTGATGCAGCTCTCGGAGGGCGAAGAATCTCGTGCTTTCAGCTTCGATGTAGGAGGGCGTGGATATGTCCTGCGGGTAAATAGCTGCGCCGATGGTTTCTACAAAGATCGTTATGTTTATCGGCACTTTGCATCGGCCGCGCTCCCGATTCCGGAAGTGCTTGACATTGGGGAATTCAGCGAGAGCCTGACCTATTGCATCTCCCGCCGTGCACAGGGTGTCACGTTGCAAGACCTGCCTGAAACCGAACTGCCCGCTGTTCTGCAGCCGGTCGCGGAGGCCATGGATGCGATCGCTGCGGCCGATCTTAGCCAGACGAGCGGGTTCGGCCCATTCGGACCGCAAGGAATCGGTCAATACACTACATGGCGTGATTTCATATGCGCGATTGCTGATCCCCATGTGTATCACTGGCAAACTGTGATGGACGACACCGTCAGTGCGTCCGTCGCGCAGGCTCTCGATGAGCTGATGCTTTGGGCCGAGGACTGCCCCGAAGTCCGGCACCTCGTGCACGCGGATTTCGGCTCCAACAATGTCCTGACGGACAATGGCCGCATAACAGCGGTCATTGACTGGAGCGAGGCGATGTTCGGGGATTCCCAATACGAGGTCGCCAACATCTTCTTCTGGAGGCCGTGGTTGGCTTGTATGGAGCAGCAGACGCGCTACTTCGAGCGGAGGCATCCGGAGCTTGCAGGATCGCCGCGGCTCCGGGCGTATATGCTCCGCATTGGTCTTGACCAACTCTATCAGAGCTTGGTTGACGGCAATTTCGATGATGCAGCTTGGGCGCAGGGTCGATGCGACGCAATCGTCCGATCCGGAGCCGGGACTGTCGGGCGTACACAAATCGCCCGCAGAAGCGCGGCCGTCTGGACCGATGGCTGTGTAGAAGTACTCGCCGATAGTGGAAACCGACGCCCCAGCACTCGTCCGAGGGCAAAGGAATAGCACGTGCTACGAGATTTCGATTCCACCGCCGCCTTCTATGAAAGGTTGGGCTTCGGAATCGTTTTCCGGGACGCCGGCTGGATGATCCTCCAGCGCGGGGATCTCATGCTGGAGTTCTTCGCCCACCCCAACTTGTTTATTGCAGCTTATAATGGTTACAAATAAAGCAATAGCATCACAAATTTCACAAATAAAGCATTTTTTTCACTGCATTCTAGTTGTGGTTTGTCCAAACTCATCAATGTATCTTATCATGTCTGTATACCGTCGACCTCTAGCTAGAGCTTGGCGTAATCATGGTCATAGCTGTTTCCTGTGTGAAATTGTTATCCGCTCACAATTCCACACAACATACGAGCCGGAAGCATAAAGTGTAAAGCCTGGGGTGCCTAATGAGTGAGCTAACTCACATTAATTGCGTTGCGCTCACTGCCCGCTTTCCAGTCGGGAAACCTGTCGTGCCAGCTGCATTAATGAATCGGCCAACGCGCGGGGAGAGGCGGTTTGCGTATTGGGCGCTCTTCCGCTTCCTCGCTCACTGACTCGCTGCGCTCGGTCGTTCGGCTGCGGCGAGCGGTATCAGCTCACTCAAAGGCGGTAATACGGTTATCCACAGAATCAGGGGATAACGCAGGAAAGAACATGTGAGCAAAAGGCCAGCAAAAGGCCAGGAACCGTAAAAAGGCCGCGTTGCTGGCGTTTTTCCATAGGCTCCGCCCCCCTGACGAGCATCACAAAAATCGACGCTCAAGTCAGAGGTGGCGAAACCCGACAGGACTATAAAGATACCAGGCGTTTCCCCCTGGAAGCTCCCTCGTGCGCTCTCCTGTTCCGACCCTGCCGCTTACCGGATACCTGTCCGCCTTTCTCCCTTCGGGAAGCGTGGCGCTTTCTCATAGCTCACGCTGTAGGTATCTCAGTTCGGTGTAGGTCGTTCGCTCCAAGCTGGGCTGTGTGCACGAACCCCCCGTTCAGCCCGACCGCTGCGCCTTATCCGGTAACTATCGTCTTGAGTCCAACCCGGTAAGACACGACTTATCGCCACTGGCAGCAGCCACTGGTAACAGGATTAGCAGAGCGAGGTATGTAGGCGGTGCTACAGAGTTCTTGAAGTGGTGGCCTAACTACGGCTACACTAGAAGAACAGTATTTGGTATCTGCGCTCTGCTGAAGCCAGTTACCTTCGGAAAAAGAGTTGGTAGCTCTTGATCCGGCAAACAAACCACCGCTGGTAGCGGTTGGTTTTTTGTTTGCAAGCAGCAGATTACGCGCAGAAAAAAAGGATCTCAAGAAGATCCTTTGATCTTTTCTACGGGGTCTGACGCTCAGTGGAACGAAAACTCACGTTAAGGGATTTTGGTCATGAGATTATCAAAAAGGATCTTCACCTAGATCCTTTTAAATTAAAAATGAAGTTTTAAATCAATCTAAAGTATATATGAGTAAACTTGGTCTGACAGTTACCAATGCTTAATCAGTGAGGCACCTATCTCAGCGATCTGTCTATTTCGTTCATCCATAGTTGCCTGACTCCCCGTCGTGTAGATAACTACGATACGGGAGGGCTTACCATCTGGCCCCAGTGCTGCAATGATACCGCGAGACCCACGCTCACCGGCTCCAGATTTATCAGCAATAAACCAGCCAGCCGGAAGGGCCGAGCGCAGAAGTGGTCCTGCAACTTTATCCGCCTCCATCCAGTCTATTAATTGTTGCCGGGAAGCTAGAGTAAGTAGTTCGCCAGTTAATAGTTTGCGCAACGTTGTTGCCATTGCTACAGGCATCGTGGTGTCACGCTCGTCGTTTGGTATGGCTTCATTCAGCTCCGGTTCCCAACGATCAAGGCGAGTTACATGATCCCCCATGTTGTGCAAAAAAGCGGTTAGCTCCTTCGGTCCTCCGATCGTTGTCAGAAGTAAGTTGGCCGCAGTGTTATCACTCATGGTTATGGCAGCACTGCATAATTCTCTTACTGTCATGCCATCCGTAAGATGCTTTTCTGTGACTGGTGAGTACTCAACCAAGTCATTCTGAGAATAGTGTATGCGGCGACCGAGTTGCTCTTGCCCGGCGTCAATACGGGATAATACCGCGCCACATAGCAGAACTTTAAAAGTGCTCATCATTGGAAAACGTTCTTCGGGGCGAAAACTCTCAAGGATCTTACCGCTGTTGAGATCCAGTTCGATGTAACCCACTCGTGCACCCAACTGATCTTCAGCATCTTTTACTTTCACCAGCGTTTCTGGGTGAGCAAAAACAGGAAGGCAAAATGCCGCAAAAAAGGGAATAAGGGCGACACGGAAATGTTGAATACTCATACTCTTCCTTTTTCAATATTATTGAAGCATTTATCAGGGTTATTGTCTCATGAGCGGATACATATTTGAATGTATTTAGAAAAATAAACAAATAGGGGTTCCGCGCACATTTCCCCGAAAAGTGCCACCTGACGTC

1-7. (canceled)
 8. A method of treating, or the reducing risk ofdeveloping, a disease or condition selected from kidney disease,pulmonary arterial hypertension, anxiety, depression, cancer, diabeticretinopathy, or pain, comprising administering to a subject in needthereof a therapeutically effective amount of a compound of structuralformula I:

or a pharmaceutically acceptable salt thereof; wherein: “- - -” is asingle bond or a double bond X¹ is CH or N; when “- - -” is a doublebond, X² is CH or N; when “- - -” is a single bond, X² is N(CH₃), whenX¹ is CH, X² is N or N(CH₃); Y is —O—, —N(CH₃)—, —N(CH₂CH₂OH)—,cyclopropan-1,1-diyl, or —CH(CH₃)—: Q is2-trifluoromethyl-4-fluorophenyl, 2-difluoromethyl-4-fluorophenyl,2-trifluoromethylphenyl, 2-methyl-4-fluorophenyl,2-chloro-4-fluorophenyl, 2-chlorophenyl,1-(benzyl)-4-methylpiperidin-3-yl, 4-trifluoromethylpyridin-3-yl,2-trifluoromethyl-6-fluorophenyl, 2-trifluoromethyl-3-cyanophenyl,2-ethyl-3-fluorophenyl, 2-chloro-3-cyanophenyl,2-trifluoromethyl-5-fluorophenyl, or 2-difluoromethylphenyl; R³ ishydrogen, —CH₂OH, —CH(OH)—CH₂OH, —NH₂, —CH(OH)CH₃, —OCH₃, or—NH—(CH₂)₂OH; and when “- - -” is a double bond, R⁴ is absent; and when“- - -” is a single bond, R³ and R⁴ are taken together to form ═O; andeach of R⁵ and R⁶ is independently hydrogen or —CH₃, provided that if X¹is N, X² is N, Y is —O— or —N(CH₃)—, and Q is 2-trifluoromethylphenyl,then at least one of R³, R⁵, and R⁶ is not hydrogen.
 9. The method ofclaim 8, wherein the disease or condition is kidney disease selectedfrom Focal Segmental Glomerulosclerosis (FSGS), Diabetic nephropathy,Alport syndrome, hypertensive kidney disease, nephrotic syndrome,steroid-resistant nephrotic syndrome, minimal change disease, membranousnephropathy, idiopathic membranous nephropathy, membranoproliferativeglomerulonephritis (MPGN), immune complex-mediated MPGN,complement-mediated MPGN, Lupus nephritis, postinfectiousglomerulonephritis, thin basement membrane disease, mesangialproliferative glomerulonephritis, amyloidosis (primary), c1qnephropathy, rapidly progressive GN, anti-GBM disease, C3glomerulonephritis, hypertensive nephrosclerosis, or IgA nephropathy.10. The method of claim 9, wherein the kidney disease is proteinurickidney disease.
 11. The method of claim 9, wherein the kidney disease ismicroalbuminuria or macroalbuminuria kidney disease.
 12. The method ofclaim 8, wherein the disease or condition to be treated is pulmonaryarterial hypertension.
 13. The method of claim 8, wherein the disease orcondition to be treated is pain selected from neuropathic pain, andvisceral pain.
 14. The method of claim 8, wherein the disease orcondition is cancer selected from chemoresistant breast carcinoma,adriamycin-resistant breast cancer, chemoresistant colorectal cancer,medulloblastoma, and tumor angiogenesis.
 15. The method of claim 8,wherein the disease or condition is transplant-related FSGS,transplant-related nephrotic syndrome, transplant-related proteinuria,cholestatic liver disease, polycystic kidney disease, autosomal dominantpolycystic kidney disease (ADPKD), obesity, insulin resistance, Type IIdiabetes, prediabetes, metabolic syndrome, non-alcoholic fatty liverdisease (NAFLD), or non-alcoholic steatohepatitis (NASH).
 16. The methodof claim 8, wherein the subject is a human.
 17. The method of claim 8,wherein the compound is represented by structural formula II:

or a pharmaceutically acceptable salt thereof; wherein: R¹ is chloro,—CF₃, —CHF₂, or —CH₃; R² is hydrogen or fluoro; and R³ is hydrogen,—NH₂, —CH₂OH, or CH(OH)—CH₂OH.
 18. The method of claim 8, wherein whenR¹ is —CHF₂, R² is not hydrogen.
 19. The method of claim 8, wherein thecompound is selected from any one of the following compounds, or apharmaceutically acceptable salt thereof: Com- pound Structure 100

101

102

103

104

105

106

107

108

109

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111

112

113

114

115

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117a

118

119

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125

126

126a

127

128

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132

133

133a

134

135

136

137

138

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140


20. The method of claim 8, wherein the compound is selected from any oneof the following compounds, or a pharmaceutically acceptable saltthereof: Com- pound Structure 100

101

102

104

105

112

113

114

116

124

125

128

134

135

137


21. The method of claim 8, wherein the compound is selected from any oneof the following compounds, or a pharmaceutically acceptable saltthereof: Com- pound Structure 100

101

102

104

105

114

116

124

125

128

134

135

137


22. The method of claim 8, wherein the compound is represented by:

or a pharmaceutically acceptable salt thereof.
 23. The method of claim8, wherein the compound is represented by: